Keeping them crated at night should help reduce accidents. I haven't had a puppy in a long time but I have had a lot of rescues and for them, in the first few weeks I take them out in the middle of the night when I wake up to go pee.
Some remove water, some don't.
For food take the amount they should be getting per day and cut it into meals. For a young puppy I think a lunch is important. For example, if you puppy should have 1 cups of food, then feed 1/3 cup per meal. Once they are a little older you can switch to 2 meals a day. It's easier on their digestive system. Stay consistent with your feeding times and you should be able to time potty breaks with them.
I am a firm believer in taking food up if they don't finish it within a certain time period. Many times free feeding leads to obesity in adulthood. And like I said above it's easier to predict when they will need to potty.
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