Untreated water is unsafe to drink. Bottled water is cheap and available everywhere. Problem is so are the heaps of empty polythene bottles. Places in India, particularly in the towns seem to be disappearing under a pile of litter and pollution. We saw families living on refuse heaps earning a living by scavenging and recycling.
In hotels, think about drinking boiled water or take water purification tablets with you to try and cut your contribution to this ever increasing problem.