Crystal Light

Crystal Light is the name of a sugar-free, energy-free beverage (originally just a beverage powder, which could be soluble in water). It comes in many different flavors, and is made by Kraft Foods.

Originally marketed in 1984 with Linda Evans as its spokesperson (the company got Evans to endorse the product as her character on Dynasty was named Krystle Carrington), the company later had stars Raquel Welch and Priscilla Presley as spokeswomen.