Any suggestions for a good system for keeping water clean in the loft? I currently have a cat water station (jug that replenishes a bowl). For the winter I have a heated dog bowl. My chicken waterer has not worked because it fills with shavings and droppings. All work fine, but they are a pain to keep clean. I have a hose that goes to the loft and an outside birdbath in their wire pigeon porch that is usually filled with clean rainwater or the hose. But I still feel their indoor water isn't as clean as I'd like and I have a hard time cleaning/moving bowls of water - especially in the winter. Suggestions? Pictures?