Anyone on anti reflux formula ?

My LO has been since 3 months and will be til she stops having formula. (We’re on aptamil). But on the boxes of all these formulas they sometimes vary of how your meant to make them. I was always doing the hot shot method either with kettle or with tommee tippee machine. Shake, then, the colder water after. But someone pointed out who was sitting my LO for me that the box says boil kettle, wait 45 mins blah blah blah. I spoke to a friend who has a baby who’s much younger than my LO who’s also on anti reflux formula and they said ‘who has time for that’. And it’s true it’s a right faff! So I thought when this baby care person pointed out the method the box says on making the bottle, oh god have I been killing all the nutrients in her formula all this time by doing typical method most use for making formula bottles. I mean my LO is thriving, no health or weight issues. So wondering if anyone else who’s been on anti reflux formula all this time has also been doing hot shot type method of making bottles of been doing the boil the water then wait 45’mins type method all this time?