We use a flat, round plastic dish for their water; it's about 12" across and place it in a corner so they don't walk over it much, and because of the size, even when they do, it rarely tips.  For feeders, we use the little plastic gizmos that you screw a quart jar into.  First we screwed the bottom of it to a piece of plywood that's about 16" x 8" or so...it was just a piece we had laying around.  It provides enough stability that they pretty much can't knock it over and what gets spilled lands on the board rather than on the ground so it's easier for them to find and eat.