New mom here! Help please with powder formula

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Hi! So we just left the pediatrician, and long story short we are switching our formula from Enfamil Neuro Pro to Gerber Soothe. It seems the Gerber Soothe only comes in powder, not premade like Enfamil.

So my question is- what do I do for when we’re out of the house? Premix bottles? Put powder in bottles and bring bottled water? What works best for other powder using mamas?

Thanks!