I tried the metal ones and they for tipped easily. I now use the plastic crock dog dishes from Wal Mart.
Never tipped.
These are what I use. They stack with room for water so you can stack them to go to the sink, wash refill and still carry them all at once. I have had them spill before, but not as much as any other I have tried. reptilebasics sells them too.
http://www.iherp.com/mikel81
0.1 Eastern Garter
2.0 Corns (snow+black)
0.1 Brazilian Rainbow Boa
1.1 Jungle Carpet Pythons
1.1 Orangetail Hypo Het Anery Hog Island Boas
0.1 Super Jamp Retic Balls:
0.1 Normal
1.1 Lesser
0.1 Pinstripe
0.1 Mojave Orange Ghost
1.0 Orange Ghost
0.1 Cinnamon het Orange Ghost
1.0 Phantom