Updated: Oct 25, 2019
DIY El-liquid stands for 'do-it-yourself' E-liquid. Basically, you purchase the raw ingredients and equipment that you need and then create your own E-Liquid, instead of buying a ready-made E-Liquid from your local vape shop.
Put simply, to make your own E-Liquid, all you need to do is mix Propylene Glycol (PG), Vegetable Glycerin (VG) flavouring and nicotine (depending on whether you vape a zero nicotine E-Liquid or need that extra hit).
The quantity of the ingredients depends on what outcome you are looking for, but either way, they need to be chosen carefully to ensure a good PG/VG ratio, nicotine strength and the perfect flavour profile.
The amount of effort you have to put in varies with DIY juices. For example, 'flavour shots' are available to purchase, meaning that you only have to add a flavour to a PG/VG and nicotine base. On the other hand, the majority of 'DIY-ers' choose to mix flavourings themselves, meaning they will buy a variety of different flavours and do a bit of trial and error until they find the right quantities of each to create the desired flavour.
To be able to make your own DIY E-Liquid, it's important to ensure you have the correct equipment and understand exactly what you have to do.
Obviously, you'll need a container to mix the liquids together, but the other important things you need are nitrile gloves, goggles and an apron. These measures are really only taken because of the nicotine, especially if you are using a high-nicotine base. In addition to having safety equipment, having a separate syringe or pipette to use for nicotine is handy as it prevents cross-contamination.
The most important thing to keep an eye on is your nicotine strength. This is the easiest mistake to make so try and plan this part out carefully and use a mixing calculator. If you add too much nicotine, then your final product will be much stronger than you intended and give a harsh throat hit. It's very unlikely that you'll put too much nicotine in and cause yourself harm, but it's better to double check how much you need to put in just in case.