My mothers garden has 6 hedgehogs, 2 babies, 1 female, and 3 very,very large males. We always have a bowl of water available, which the adults can reach. When l saw the babies l got a couple of planter saucers, one we put on the grass with water in it, so the babies can get a drink. The other one is full of dried fruit and cat biscuits, we tried wet cat food, but the plates were cleared by passing cats before the hogs had a chance to eat.
We cut a hole in our front garden gate, initially so our ageing stray could get in and out easily, but the hogs use it all the time.