We bought THESE once we had been feeding "Local community" cats and they were pretty handy. I realize they're plastic, but I had been considerably more worried about keeping the ants out in the food than I used to be with the fabric of your bowls. I still use these https://jaidenaksbi.blogdiloz.com/2350813/the-smart-trick-of-largest-pet-shop-in-dubai-that-nobody-is-discussing