Different water causing diarrhea?

We've just come over to Ireland for Christmas and we come from a hard water area, they have spring water on tap and it's very soft. We have been using the tap water (boiled) for Sophie's formula feeds since yesterday morning and this evening she has had two very runny poo's. She usually goes every other day or at most once a day, she had one poo earlier which was firmer but that makes 3 poos in one day which is unheard of.



Does anyone know if a change of water due to being in a different place can cause diarrhea?



I'm not sure what we'll do if it continues as we're in the middle of nowhere and snowed in, and not registered around here for a Dr, starting to worry a little!



She is fine in herself and has been very cheerful most of the day, I've checked her temperature and it's fine, the only other thing is that she has a bit of a stuffy nose (husband had a cold last week so wondering if she's getting that).



Anyway, this is a bit rambled really, I'm such a worrier at the best of times - let alone when snowed in somewhere! If anyone has any advice I'd much appreciate it.



Kat & Sophie (3 months) x