You can make your own diet shake. The rule is 15 grams of protein per serving, and no more than 100 calories. You can blend cottage cheese, ice cubes, artificial sweetener (Equal, Splenda, SweetnLow, Truvia) and vanilla extract or sugar-free Hershey’s or Walden Farms chocolate syrup. You can blend flavored Greek yogurt, ice cubes and artificial sweetener. You can blend tofu, ice cubes, artificial sweetener and vanilla extract or sugar-free Hershey’s or Walden Farms chocolate syrup.