How come no one said about Art Friend? They sell a big sheet of sticker paper for $2.50. the size i think is around A3-A1.. not sure. then u can cut them out urself or i help u cut out.. haha.. XD
Water ah?.. if u mean sweat then no. Just remember to wipe the stickers after playing. Chemical reactions betweem sweat and glue is very slow, so wipe teh sweat of before the reaction takes place..