The only thing about that is that the bread tastes stale. It undergoes some kind of chemical change sitting out.
You might try drying it out in a dehydrator, or in a gas oven with a pilot light, or by heating an oven, turning it off, and dehydrating your bread in that.
Granny, do you know?
Boiling
Bringing water to a rolling boil for 3 to 5 minutes will kill most water-borne microorganisms. However, boiling of water may concentrate toxic chemical or heavy metal contamination.
Disinfection
Household bleach, if used properly, may be used to kill microorganisms. See Water Storage Guidelines for more information. The use of bleach does not address toxic chemical or heavy metal contamination.
Filtration
Water filters can be effective in purifying water contaminated with microorganisms, toxic chemicals, and heavy metals. The effectiveness of these products depends on design, condition, and proper use. Water filters produced by Seychelle have been used successfully by Church missionaries for many years.

Thank you for the wonderful posts, they are perfect and I should copy and save them.
How nice to find new posts that I had not read before.
The energy is low, so I am not getting far with posting.
I am so glad you joined in on the thread.