Is it safe to drink the tap water in Spain, DS is of on a school trip on Friday and they have been told to brink a refillable drinks bottle, and fill it with tap water before there day trips to save buying bottled water!! I was sure that you shouldn't drink the tap water and would rather him buy a large bottle of water and fill up his bottle. Any advice would be gratefully recieved ( we have only been to spain once and that was years ago and I'm sure we did not drink the tap water even used bottled water for cleaning teeth!!!)

I would recommend sticking with the bottled water.