Regardless you are visiting a wildlife safari, but you can’t compromise on your urban habits. Check with your tour operator if you will get facilities like the coverage of WI-FI, breakfast, wake-up call, facility of modern bathroom, supply of mineral water to drink, a pool of soft water for personal use, etc.
In this area of Sundarban, most resorts supply local water for personal use like bathing, etc., for their guests. Few luxury resorts like Sundarban Tiger Roar Resort offer unlimited soft water for the guests to maintain their water treatment plant.