We haven't tried this yet ourselves, but we imagine that you could substitute 1 tablespoon of acai powder for every one 100 gram packs of acai puree. Try adding about 125 grams of ice per 1 tablespoon of acai powder to give this smoothie the texture it needs. You may also need to add more nut milk if you try this method. If you give this method a try, let us know how it goes!