Fresh Dog Water

I thank all of you for your responses to my question about how to keep dog water fresh outside. I have my doubts that any plastic bowl will work for my dogs outside as I have at least one MAJOR plastic and wood chewer who has 2 cohorts in crime to aid her while I am at work. I bought a LARGE plastic bowl with slanted down sides at PetSmart and filled it with water and it is pretty heavy when full. It has become quite an outside playtoy so then I started using a plastic bucket with a handle but they turned that over, too--and it is VERY heavy when filled with water. So, ingenious me, I enlarged one of the many existing holes in my backyard, which, by the way, looks somewhat like the surface of Mars thanks to the sweet darling digging and chewing babies, and I sort of sunk the bucket partway into the ground. So far, they have not been able to turn it over although they have snacked on the edge of the bucket. But, I have to lift it and dump it and rinse it out daily as it begins growing mold daily. And the outside of it is muddy so I get dirty and it is heavy, etc. So, I think that the little dealies with the 2L bottle on top or the empty soda bottle on top would be considered a snack item by these guys. I will have to call the vet and ask about the toxicity of bleach or the stuff that goes in ponds. Or, I saw a thing called Waterdog online that you attach to the outside faucet but it looks sort of inviting to chew on, also, so not sure about that. I have bought many chew toys for them to chew on but they appear to prefer chairs and screen and flowerpots and waterbowls and rugs and tables. It's a good thing they are cute!!!!!