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.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 ) won't be so high
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