Custom Box Service has three kittens.

Earlier in the week, Jeff startled a black cat from the lawnmower shed. She took off like a flash. Yesterday he discovered three hungry kittens in the same shed, hiding under some tarps. The black cat must be there mother, but there's no sign of her now. Unfortunately, Mama Cat may have abandoned her babies.
The three kittens — which are as adorable — are hungry. We don't know how old they are, or what to feed them. We have a case of cat food from several years ago — the cans are marked "best by July 04". We figure it's our best choice. I gave them each a dollop of wet food this morning. One devoured it, another munched on it idly, and the third ignored it completely.
Later I took out a bowl of water, but my little friends were oblivious to it. They walked through it, stumbled in it, stuck their noses in it, but they did not drink.
What should we feed a trio of kittens that are a few weeks old? They don't seem big enough to be weaned. (They may only be a couple weeks old. As I say, we can't tell how old they are.) Is wet cat food safe? Should we get them some milk?
They already have little personalities. One of the grey kittens likes to follow the guys around the lawn. The black kitten has an amazing set of lungs, and its wailing can be heard from a great distance.

But I have to tell myself not to get attached to these babies. The odds that they'll survive are near zero. It's hard, though. I love kittens. I really do.
These kittens are at least 5 weeks old, probably older, based on how they look on the web. Kittens do not get their eyes open for at least a week and don't crawl well for about 3 weeks. It appears these guys are up and doing well walking around. For food, get a bowl of room remperature to warm milk and literally stick their noses in it so it gets all over their face....they will lick it off and soon understand what the milk really is. This may take a few tries each day. Most kittens can easily be weaned at six to eight weeks...so they should survive, but you will need to help the situation along. Wet cat food is OK, they just don't really know what to do with it yet. They may also need a way to keep warm at night...mama cats are good for that! Good luck with your new family!