If you choose to take these extra measures, take them all the time, not just at home. If your local public health office warns you to boil your water, don't drink tap water unless you make it safe. You yourself can see that the water was boiled and that it was stored safely. After your boiled water cools, put it in a clean bottle or pitcher with a lid and store it in your refrigerator. Use the water as you normally would.
Ice made from contaminated water can also contain cryptosporidium.
To be safe, make your ice from boiled water. Water bottles and ice trays should be cleaned with soap and water before you use them. Do not touch the inside of your water bottles or ice trays. If you can, clean your water bottles and ice trays yourself. NSF is an independent testing group.