Hey may suggest water and water colour? or food colour but water colour works best I think.This looks great! I plan on using it soon, once I can get some of the bottles to start with Felix has always been one of my favorites. Has anyone ever put anything in the bottles? To represent potions? I'm thinking of getting some of those new water beads they have to use for plants in different colors and putting those in there. Does anyone have any thoughts or comments on that?