Microwave water first… then add the formula. Did it with 4 kids and now my grandkids 
I put hot water in a pot from the faucet. Put the bottles in (I have twins) then I change their diapers and water is ready within 5 minutes. I don’t heat in microwave or boil water.
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N0 Microwave !!! Anything else but that. You can microwave water in a glass bowl and warm the bottle in that.
I used a pot on the stove
50ml of boiled hot water the rest cool boiled water,
Microwave is fine as long as your buying BPA free bottles!
I used a bottle warm.
They sell bottle warmers
We boil water in a kettle for the days worth. She drinks it room temp
I boiled a pan of water on the stove and set the bottle in for a couple of minutes and then test on my wrist
I use the microwave, just make sure your bottles are BPA free. Water alone in microwave, then add formula.
I never heated my kids bottles. Room temp bottled water to mix.
They make a baby bottle warmer.