Advice on drinkers please

Hanging up gravity wateres doesn't really work. Apart from being heavy, they need to be kept level, or the water would all tip out. Every time one drinks, it would tip it up, resulting in a swamp below it, and possible lots of wet birds having a shower.  (remember that muddy swampy areas grow bacteria, so waterer is best moved around, You can buy special water steps, but I found they horrid to clean. I just move the water a bit every time I refill it.
                               
                                                                                                                                'Mimey