…to a reasonable degree, at least.
Would it be better to pressure sterilize it? Or would using distilled water be sufficient?
Not sure about pressure sterilization, I guess as long as it kills everything.
Distilled water is safe.
Does this recipe need high precision? Because maybe that is a no-no for people without a decent scale and some volumetric equipment. Sure, if you already have this stuff it’s fine, and probably you know good practices like using a properly treated volume of water. But if you don’t, it’s perhaps better to just buy the cheaper stuff.
Not at all. If you feel it burning, just water it down a bit more. No harm done.