May i know what kind of water to use to make fm when overseas? Do we boil tap water and let it cool or can we get mineral water off the shelves?

I think best to buy distilled water. Cannot use mineral water because of the minerals in it is not what baby need. If the tap water is drinkable then boil and bring with u when heading out. How old is baby? Have u started solids? I would try to see if can give 1 solid at hotel before heading out and/or 1 solid when outside so that the demand on the fm (thus the need to lug the water around - later not hot alrdy) won't be so high