I bought some ry4 a couple of weeks ago and I really liked it so I just bought another 30 mls but I can't really taste the flavour like I could before. It could be because I have given up the analogues and my taste has changed. Anyway I have ordered some vanilla and caramel favouring but I have no idea how much I should put in. Should I start with just a couple of drops of each then leave overnight and test in the morning or should I use more? And should I leave it more than 1 night before testing it? I have never done any mixing before so I haven't got a clue. I don't want to waste 30ml of juice either.