33gal freshwater, about how long will it last?

Our dog is very sensitive to his water supply; that is why he passes up the fresh water in the dog water bowl and goes out back to drink the scummy pond water.

It seems a two day old mud puddle is when it is at its finest. Doggy Aqua Vitae.

We drink, cook and wash with our fresh water tank supply, which we drain and refill before each trip.

And yes, when watering the garden, I still drink from the hose. Come on folks, be reasonable.