I bet that bowl could be tipped pretty easy regardless of what you put in it. Its just to easy to get under that one.
Get a actual pet water bowl. Or already a heavy lipless bowl with a good flat bottom.
Pet stores have ceramic bowls that don't cost to much. In the long run any nice snake bowl are pretty cheap cause they can last you forever if well taken care of.
This is what I use for my BP
http://www.pet-tech.com/products/liv...&category_id=1
Its a nice product. They have cheaper smaller ones that are just a great.