Place strawberries, 1/2 cup water and 1 tablespoon sugar in a food processor; pulse until combined. Divide among cups. Top cups with foil and insert sticks through foil. Freeze until firm, about 2 hours., Wipe food processor clean. Add clementines and orange juice; pulse until combined. Spoon over strawberry layer. Freeze, covered, until firm, about 2 hours., Repeat with pineapple and the remaining water and sugar. Spoon over clementine layer. Freeze, covered, until firm.