After a four-store search I found popsicle molds, and now we make our own out of juice or iced tea instead of buying sugar- and food-coloring laden ones from the store. The only downside? These will only last about a day-- as soon as they're set my kids dive in...and in...and in. But who cares? They're happy and hydrated, and I don't have ADD kids amped up on red dye and sugar running amok. (and no, I'm not making a dig at rambunctious children--my kids really do have it. It makes for an interesting life)
Anyway, try making your own! I've even used things like homemade or iced tea. Pureed fruit works too, though you may have to thin it with a little juice. Give it a try!