I suggest you to bring Distilled Water 蒸餾水 instead of Mineral Water since baby cannot absorb too much minerals.
Last week, I went to Lantau Island for 3 days-2nights, I bought Watson's 開奶 and no problem to my baby.
My sister bought her baby to New Zealand for 1-2 weeks few years ago and brought a big bottle of water (boiled at home) and mixed the water in New Zealand to 開奶.
Maybe you can try to test your baby reaction before going....
We've been using the bottled mountain spring water to make formula for bb (now he's a week from 16 months old and ok so far). The tap water in our area is hard water, so we cannot drink it until it's filtered.