Should i be concerned if i drink 5 bottles of water each day . 16.9 fl oz (1.05pt) 500ml each bottle . is it bad ?

Probably not: However, are you drinking 5 bottles of water because you are thirsty or because someone thought it was a good idea? Unless you have a history of kidney stones, you should be fine to drink somewhat less than 2.5+ liters of fluids (5 bottles of water + other sources of water). For most patients, a total daily intake of 2L of fluids should be more than adequate.