The amount of protein in a glass depends on how much sattu powder you add and what the powder is made of. Check the ingredients first. Plain roasted chana sattu and a mixed drink powder can have different nutrition labels.
Weigh the powder before adding water
GovindJee Chana Sattu lists 22.5 g of protein per 100 g. If you use 30 g, that gives about 6.8 g of protein from the sattu in your glass. GovindJee nutrition information Adding more plain water changes how strong it tastes. The amount of sattu you started with stays the same.
Decide what you want from the drink
Try lemon and jeera for a savoury version. If you use a sweetened mix, check the sugar line as well as protein. Save your pack figure so you can reuse it the next time you make the drink. Build a vegetarian tiffin · FSSAI’s guide to reading labels
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Keep the same spoon next time
Weigh the amount your usual spoon holds once. A heaped spoon can hold more than a level one, so make a note of which you use. If you share a jug, start with the total powder and divide by the number of equal glasses. If you add milk instead of water, count the milk separately if you want the total protein. For a ready mix, use that mix’s own label.