You are better to make the transition now as opposed to a month from now, in my opinion. You can't trust the water there AT ALL. In fact, it was only a few years ago that formula companies urged mothers there to quit breastfeeding, and use formula only to find out the majority of the children died. Go figure. So, you can't rely on having access to good water there. Not to mention, what if you get stuck somewhere and she wants milk? All your bottled water is gone???? So, I think you have the right instincts about this. Go ahead and make the switch.
Not to mention, other countries do sell the ultra homogenized milk.