That's a reasonable question, from a scientific perspective, I suppose.
But, even if the answer is a hard NO, it's not likely to sway the argument in my household. 🤣
Our concern is more about taste (and maybe a bit of a YUK factor?).
I can imagine us using the fresh tank for drinking only if there is some post-tank purification (like a fancy filter or RO or whatever). So far, I haven't come up with a practical way to pull that off.