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Ok this is what you can do. I used similac as well for my one year old when we went to India this feb. I went to chennai, so its more harsh weather than your place I hope.
How long are you planning to stay?
In its a short term (a month) then you can get the powder and Dont keep it fridge (With current cuts and stuff it will spoil the powder). It is best to keep in an airtight container (Buy a good container from here too).
Evian is the closest good water that you can get in India. Use that only.
If its long term, do you go by Chennai? I found a store that sold Similac powder and also the ready to use formula. And it was such a savior !!!
Let me know.