I'll be traveling to Taiwan in Jan next year when my lo turns 15mo. Is it necessary to bring tap water to mix with water over there for his consumption?

I will bring 1 liter water from here to the traveling places. When reach that location, I will mix some water that I bring with the water boil at the hotel and drink it for the first 2 days. This is to adjust our body system. That is mother taught me. I'm feel it's work on me. You may try it.