I have one hide I got at PetCo (though you could find it for much cheaper online, reptilesupply.com, for instance) that is made of some kind of plaster and looks like a rock. It is heavy, so my girl can't lift it or knock it over. It also doubles as a basking spot, as the top is rounded. She likes to lie on top of it when she gets too warm or wants to stretch out.
I also sometimes use cardboard boxes. Shoeboxes (depending on size), Kleenex boxes (my girl outgrew those a while ago), packaging boxes, or whatever else work well. I like using boxes because I can shrink them by cutting off one side and retaping it farther up, making the hide more snug and secure. One bad thing about boxes is that they can't be washed and must be replaced every few months, or when soiled. But they aren't that hard to find; I spent Christmas day scanning the living room for appropriately-sized boxes.
If you want a water bowl on top (I have never heard of that, but it sounds like a good idea), you'd probably have to make it out of clay or something. I bet you could take an old, appropriately sized tupperware container and place it on top of a clay hide, then secure it with more clay. That might be easier than trying to make a bowl out of clay.
