How Much Water Do to Add in a Protein Shake Thanks for this question. I am a regular user of protein supplements and I take them almost daily. Over the years, some things I have noticed is that there is no mandatory rule about how much water to add. You can add it based on your liking. I usually add around 200-300ml of water, while a friend of mine has it with more water. The answer to “How much water to add in a protein shake?” depends on you. Important Protein Powder Points: Ingredients: Check for additives in the product. Some brands add chemicals like artificial sweeteners, colors, flavours, emulsifiers, thickeners, preservatives, etc. that are not good for health. Authenticity: Go for products that are authentic. Always buy from a known dealer or a known website. Check the barcode, and the genuineness seal of the product. There are many fake products in the market, and they contain growth hormones, steroids, fillers, oils, fats and carbs. Diet: If you have a diet filled with fat, carbs and calories, then taking protein supplements can add to your putting on weight. This is because supplements have other things added to them, not just protein. Always check with your nutritionist about how much supplement to take daily (scoops, etc.) Milk can make you put on weight and can be hard to digest since it already has a lot of fat and carbs. Each person has a different requirement of protein, depending on your lifestyle, your food habits, your workout routine, etc. You can also check out: Mudit Goel's answer to Which is the best Indian whey protein supplement?