To prevent your frozen pipes from bursting, leave the nearest faucet on to give the water a way to escape. Letting the water drain out will relieve pressure in the frozen pipe, which will reduce the chances of it bursting and damaging your home. A couple of different types exist, so one will be available regardless of whether you are trying to seal galvanized steel or plastic. Big box stores or plumbing supply stores carry both kinds and the salespeople can give you advice on which is best.
Look at loose tiles to see if they were caused by water damage. Loose tiles are frequently an indicator that you have a leak somewhere, and it needs to be addressed. Push lightly against the tile to see if it moves or the subsurface has any give in it. Consider loose tiles to be an early warning system so you can schedule a repair right away.