what feeders do you use?

I use a suspended plastic bell shaped one. it holds 2 days worth of pellets for 4 chx. I always wait until it's empty before replenishing. Its suspended from the coop's run roof so is kept dry.

For water I got a budgie stainless steel dish that attaches to the wire mesh side of the coop. This is positioned high enough that it can't be fouled. It doesn't hold much, about 1 litre but I know it can't be knocked over. I also use a large, heavy dog bowl too, which the chx prefer, but this they regularly foot bathe in.  In the summer when they need more water I also add an old plastic toy box.

There seems to be no perfect product for feeding or water.