I buy the Mexican ones that taste like strawberries. I buy them at Walmart too.
I also buy a drink from Kroger that taste like a smoothie. It's in the Soy and Rice milk section. I don't remember what is called and I'm out of it so can't check my refrigerator. But it's good for intestines. Just make sure he drinks it 14 days from opening the carton. You can just tell him you made him the smoothie and he will never know it's a probiotic drink