Açai berries are normally found in frozen fruit packs. Some of those fruit packs contain additives and preservatives, so when you're looking for one, make sure to read the ingredients so that you find one that has just the frozen berries with no additives.
There are many fruit combinations you can have to create an Açai bowl/smoothie. I keep mine quite simple though. However, by adding 3 bananas to it (yes, I know, 3!!), it becomes quite filling and is the perfect breakfast or post-workout meal.
1 Açai pack
1 cup of frozen red grapes (I wash them right after buying and then put them in the freezer so they're ready to use)
1/4 cup raisins (rinsed)
1. Slightly thaw the Açai pack and then add to a blender/smoothie maker
2. Add the remaining ingredients and blend.
I sometimes sprinkle coconut flakes on top or some of my homemade granola.