@nanaa85co How (or whether) to sterilize drinking water is an individual decision.
I choose to use a 0.2 micron filter water setup at my kitchen tap in place of boiling; I carry that water with me around home and in my car, and use bottled spring water other times. BUT, I do not have any evidence of GERD, so am not fanatical about it. I drink brewed tea/coffee/mixed beverages away from home - it has worked for me for over 8 years with no reinfection.

I do use my filtered water for washing/rinsing equipment, fruit, vegetables, etc. I use distilled water to boil my equipment to sterilize it (it doesn't leave mineral deposits on stuff.) Here is a description of the filter system we customized, and have used for years:
https://connect.mayoclinic.org/discussion/possible-new-diagnosis/
If you choose to boil water for
washing equipment and drinking, bring it to a roiling boil in a pot or kettle, boil 5 minutes, then pour it into sanitized containers and cap them. Water remains safe for at least 2 weeks based on Dr Honda's tests that were reported yesterday at the conference.

You do NOT need to preboil the water that will be used to sterilize your equipment in a steamer, baby bottle sterilizer, or pan - the process will kill any bacteria.