i have a food dish that screws in but i dont like it. and regular cups my piggies dump over....and sit in the pile of pellets! (greedy little pigs!) its cute but annoying to clean all the time.... any suggestions for other tip proof/resistant options???? what kind of bowls do you guys use.....and also i see people put how much food they give in cup size.....my understanding was u just fill whatever bowl u use to the top is this wrong???