1/2 c. or more Tang
1 can condensed milk
2 cartons sour cream
1 (12 oz.) carton Cool Whip
Graham cracker crust

Mix Tang, milk and sour cream. Spread on graham cracker crust, and top with Cool Whip.

GRAHAM CRACKER CRUMB SHELL:

1 1/3 c. graham cracker crumbs (about 16 crackers)
1/4 c. butter
1/4 c. sugar