Bangaloreans are used to being very careful with water - with the precious commodity being supplied only on a few days of the week. But this week there is an additional challenge - there will be no supply at all from the Cauvery River for up to two days as the Bangalore Water Supply and Sewerage Board finishes some pipeline work. The ultimate aim is to improve water supply to the city but the next couple of days are likely to be challenging for residents.