If you've recently switched to larger shortfill bottles, you've probably asked yourself the same question every UK vaper eventually does: how do you actually open a vape juice bottle to add nicotine? It sounds simple, but those child-resistant caps and tamper-evident seals can be surprisingly stubborn and getting the technique wrong usually ends in sticky fingers and wasted liquid.

This guide walks you through exactly how to open your bottle, add your nicotine shot, and mix it properly so you get a smooth, ready to vape blend every time.

Why You Need to Add Nicotine Yourself

In the UK, e-liquid containing nicotine is limited by TPD regulations to bottles of 10ml or smaller. To get around buying dozens of tiny bottles, manufacturers sell shortfills larger bottles (typically 50ml or 100ml) of nicotine-free juice with extra empty space at the top. That gap is left intentionally so you can pour in a nicotine shot, seal the bottle, and shake.

This approach gives you bigger bottles, better value, and full control over your final nicotine strength.

What You'll Need Before You Start

• Gather everything before you begin so the process stays clean and quick:
• Your shortfill bottle of e-liquid (with headroom at the top)
• One or more nicotine shots, usually 10ml at 18mg or 20mg
• A clean, flat surface and some kitchen roll
• Optional: disposable gloves, since concentrated nicotine can irritate skin

How to Open a Vape Juice Bottle to Add Nicotine

Most vape bottles use a child-resistant push-and-twist cap, which is the part that trips people up. Here's how to handle it properly.

Step 1: Press Down Firmly on the Cap

Place the bottle on a flat surface. Put the palm of your hand or your thumb on top of the cap and press down firmly. The cap is designed so it won't turn unless downward pressure is applied  this is the child-resistant mechanism doing its job.

Step 2: Twist While Pressing

While keeping that downward pressure, twist anticlockwise (lefty-loosey). Don't release the pressure halfway through, or the cap will just spin freely without unscrewing. Keep pushing and turning until the cap comes loose.

Step 3: Remove the Nozzle Tip (If Needed)

Many shortfills have a fine-tip nozzle under the cap rather than a wide opening. For adding a nic shot, you'll often want to pull this nozzle off so the wider neck is exposed, making it easier to pour the nicotine in without spilling. Gently wiggle and lift it free.

Step 4: Add Your Nicotine Shot

Open your nic shot the same way (press and twist), then carefully squeeze its contents into the shortfill. Because the manufacturer left headroom, a 10ml shot will fit neatly into a 50ml bottle. Take it slow to avoid overflow.

Step 5: Reseal and Shake

Push the nozzle back in, screw the cap back on, and shake the bottle vigorously for 1–2 minutes. Nicotine needs to disperse evenly throughout the liquid, so don't rush this step. A thorough shake guarantees a consistent strength in every puff.

Step 6: Let It Settle (Optional but Recommended)

For the smoothest result, let the bottle rest for a few hours, or “steep” it for a day or two. This allows the flavours and nicotine to fully blend. Give it one final shake before filling your tank.

Working Out Your Final Nicotine Strength

The maths is simpler than it looks. A standard combination is a 50ml shortfill plus one 10ml nicotine shot at 18mg, which gives you 60ml of finished liquid at roughly 3mg strength a popular level for sub-ohm vaping.

If you want a stronger result, you can use a higher-strength shot or add a second one to a 100ml bottle. Just remember that adding more nicotine shots also dilutes the flavour slightly, so balance is key.

Tips for a Clean, Mess-Free Mix

• Always open bottles over kitchen roll to catch drips.
• Wipe the bottle neck before resealing to stop the cap sticking.
• Wash your hands after handling nicotine shots.
• Store finished bottles upright, away from heat and sunlight.

Common Mistakes to Avoid

The biggest error is not pressing down hard enough on a child-resistant cap and assuming the bottle is faulty. The second is under-shaking, which leaves uneven nicotine distribution. And finally, overfilling if your shortfill has no headroom, decant a little juice first so the nic shot has room to go in.

If you're new to mixing, it's worth understanding the difference between standard freebase vape juice and the smoother, faster-hitting nic salt options, as each behaves differently when blended and vaped.

Conclusion

Opening a vape juice bottle to add nicotine comes down to three things: press and twist the child-resistant cap, pour in your nic shot, and shake thoroughly. Once you've done it a couple of times, the whole process takes under five minutes and becomes second nature. With a little patience and the right ratio, you'll have a perfectly blended e-liquid tailored to your preferred strength.

At Vape Wave, we make this even easier with a wide range of shortfills, nicotine shots and mixing essentials everything you need to create your ideal vape at home. Browse our collection today and take full control of your vaping experience.

Frequently Asked Questions

Why won't my vape bottle cap open?

It's almost certainly a child-resistant cap. Press down firmly while twisting anticlockwise without that downward pressure, the cap will just spin.

How many nicotine shots do I add?

For a 50ml shortfill, one 10ml shot gives around 3mg. A 100ml shortfill usually needs two shots for the same strength.

How long should I shake the bottle?

At least 1 to 2 minutes. For the best flavour, let it steep for a day before vaping.

Can I add more than one nic shot?

Yes, but only if there's room in the bottle, and bear in mind it will dilute the flavour and raise the strength.