BENGALURU, India — Bhavani Mani Muthuvel and her family of nine have around five 20-liter buckets worth of water for the week for cooking, cleaning and household chores. A resident of Ambedkar Nagar, a low-income settlement in the shadows of the lavish headquarters of multiple global software companies in Bengaluru’s Whitefield neighborhood, Muthuvel is normally reliant on piped water, sourced …