I don't feed mine in troughs. I put the sow nuts on the floor, and in the winter when it's muddy I put boards down where I feed them to stop the food from getting lost in the mud.
I've given up trying to find a water container that they can't tip over, but is easy to clean. I now use the black tough trugs, made from old tyres I think, from the agri merchants. Even my pigs haven't managed to destroy them, and they are easy to clean out.......Doesn't stop them turning them over though!
Quite a while ago now someone put some pictures on here of their water containers that self filled....Might be worth looking back through the old posts.