250-300ml. Muscle-building powder is mainly extracted from animals and milk and contains protein. It needs to be prepared according to the ratio of 1: 3. 1 spoon of muscle-building powder needs 250-300ml of water. Muscle-strengthening protein powder, a kind of protein powder, is mainly used to accelerate muscle growth and enhance physical fitness. It belongs to nutrition, and is suitable for people with weak constitution who want to keep fit and build muscles.