Becky's Baked Macaroni and Cheese (from Moncia)

In a 9X13 pan add:
3 cups macaroni (not cooked)
6 T. flour
2 1/4 tsp. salt
3 c. water
3 c. milk
6 T butter
Mix and Bake at 350 for 45 minutes, then stir in 3 c. shredded cheese when the macaroni is tender.