I think that people make different kinds of gels for their bugs for a good reason.
I imagine that you wouldn't want to eat the "non toxic" orbees or whatever those water balls are, just for the heck of it, it's probably not a good idea.
You can always buy water crystals for very cheap in large amounts, just search around some.
Or you can start feeding your bugs fruits with lots of water in them, like oranges, apples, etc