JFC has come up with a simple tipping water bowl which relies on the weight of the water to swing it open and shut. The €150 water trough has a capacity of 4-litres and a galvanised frame. If the water needs emptying all you have to do is pull the latch and the bowl swing to the side emptying its contents before swinging back and automatically latching. There are plans for other sizes and the pictured bowl should become available in the coming months.