What to feed my almost 6week old staffy puppy?

Ello can anyone give me some advice on what2feed my puppy he is almost 6weeks old( I know he should still be with mum). I have been giving him puppy milk, water and puppy food mixed with puppy milk in 3 separate dishes. He doesn't seem interested in water and barely touches his meat and Im wondering if this is ok or should I be worried he isn't taking water and barely touching his meat. He is loving the puppy milk always finishes it is there a certain amount he should have or is it cool2give him as much as he likes.