Clam Chowder

2 to 3 cans clams
4 soda crackers
1 quart milk
1 onion
2 ½ cups diced potatoes
¾ tsp salt
½ tsp pepper
2 tbsps butter
1 cup potato soup
¼ lb bacon
1 pint half and half

Drain clams. Add enough water to claim juice to make 3 cups. Crumble crackers in milk. Cook potatoes in liquid. Fry bacon and onion while potatoes are cooking. Add to potatoes. Then add soup, milk, clams, half and half and butter. Thicken with 4 to 5 tbsps cornstarch.