These steps will usually help you find the cause of a BAD tasting DIY liquids. If everything suddenly tastes horrible, even liquids that used to taste fine, your hardware is likely the problem and isn’t addressed here. If some of your DIY tastes fine, but some is horrible, skip to “Experimenting with your flavoring” If your DIY is bad, but some liquids are fine with the same hardware, this is the document for you. #1 Make a small bottle of your nic+PG+VG with NO flavoring at all. It should taste mildly sweet, nothing unpleasant. If it’s pleasant, flavorings are the problem, so skip down to “Experimenting with your flavoring” #2 If your unflavored nic+PG+VG is unpleasant, vape some of your plain VG and plain PG. If one of those tastes bad, that is your problem. If both of those taste okay, your nic is the problem. Any time you get a new bottle of nic, PG, or VG, it's good to test it before mixing up lots of liquids...just to be sure you're starting with good supplies. ---------------- If your culprit is nic, PG, or VG, it’s time to shop for better supplies. If your culprit is flavoring, it’s time to experiment. ---------------- Experimenting with your flavoring #1 Always shake the flavoring bottle before you use it. Many settle, even if you can’t tell by looking. #2 try each flavoring separately. This is good to do with every new flavoring you get. If you don’t do this before you use a new flavoring in recipes, you often end up doing it later - after you’ve wasted supplies. Pick a flavor and look around for recommended starting percentage. This is useful: https://spreadsheets.google.com/spr..._hQ6Fu8HdEwwR2dLRUJlVjlabEN1NG1ucktuUVE&gid=0 Click your brand at the top. Flavor names are down the side with the manufacturer’s recommendation (if there is one) in the grey column. The yellow column is the average recommendation from the DIYers who contributed. Each of the other columns is one person’s data (names at top of the column). Even if your flavor isn’t listed, you can often get an idea of a reasonable standalone starting point for that brand. Make a tiny batch of your (one) flavoring and see how you like it. It’s helpful to take notes. If it’s too weak or strong for you, experiment to find your preferred standalone percent. Maybe write your preferred standalone percent on the bottle. Do this for each flavoring in a recipe that tastes BAD to see which one caused the problem. Nearly always, you’ll have the problem identified by this point.