VEDIC EXPLANATION
Rig Ved Mantra No. 248

Sam Ved Mantra No. 1839

Atharv Ved Mantra No. 13 to 17

Atharv Ved Mantra No. 2198

By the above mantras of vedas we can come to conclusion that Aushadhis (herbs) dont get destroyed in fire. When Aushadhis (herbs) are put in fire during havan it stays in bhasma as nanoparticles. When Agnihotra Ash (bhasma) is added in water it makes water more Alkaline by increasing the pH value and one can also get the benefits of herbs.

The acidity causing diseases in your body is removed through urine. This is indicated in Atharv Ved Mantra No. 13 to 17.