Dispose-A-Bowl by Outward Hound is a convenient pet bowl for food and water. These nifty pet bowls are great for cars, walks, hikes, beach, camping, and vacation travel. Dispose-A-Bowl comes in a 3 pack of 40 ounce disposables bowls. Buys some disposables for all outings with your dog or cat.
I love these bowls. I use them mainly for water, not food. They folds into much smaller volume than the "canvas" type portable bowls. I keep one in my back pockets for walks on warm days. Note that the bowls do leak after a 3-4 months of use, which I find acceptable considering the price.