Green tea (no sugar)

One serving of Green tea (no sugar) — 1 cup (150 ml) — comes to 1 kcal, 0 g protein, 0.3 g carbs and 0 g fat. Scaled to 100 g it works out to 1 kcal and 0 g protein, which makes it not a meaningful protein source on its own for a beverage item. That single serving is about 0.1% of a 1,500 kcal day and 0.1% of a 2,000 kcal day, so it's more of a filler than a target-hitter on protein without much extra planning.

Walking off Green tea (no sugar) takes roughly 25 steps, using the rough approximation of 0.04 kcal burned per step (a population-average estimate for a moderate walking pace, not a personalised number). Cost data for this item wasn't reliable enough to price per gram of protein, so treat it as a calorie source rather than a protein strategy. It fits nearly every Indian diet type, including vegetarian, Jain, vegan. It works at breakfast and the evening snack slot. It's commonly eaten on fasting days (Navratri/Ekadashi-style).

If you want variety without changing the macros much, the closest swaps in the beverage category are Black coffee (no sugar), Tender coconut water, Cold drink (cola/soda, regular), Diet / zero-sugar cola — each keeps a similar role on the plate while shifting the exact protein-to-carb balance a little.