Water as origin

वायोर्विदस्तु नेत्याह न ह्येकम् कारणम् मनः॥

न ॠते शरीरात् शारीराः रोगाः न मनसः स्थितिः॥१२॥

रसजानि तु भूतानि व्याधयश्च पृथग्विधाः॥

आपो हि रसवत्यस्ताः स्मृताः निर्वृत्तिहेतवः॥१३॥

Translation: Vayorvid said " No. Mind cannot be the only reason. Without a body bodily diseases are impossible. Even existence of mind is not without body.

(I propose) Organisms and different diseases originate from Rasa. Rasa originates from Aap Mahabhoot and therefore  Aap Mahabhoot is origin of organisms and their diseases.

Commentary (Chakrapani): (Disscussion on grammatical aspects)

Commentary (Vishnu): Vayorvid literally means one who knows Vayu and here he is proposing Aap as origin. Refutation of mind as origin is very clear. but proposal by Vayorvid that Aap is the origin of both organisms as well as diseases seems convoluted. It is true that bodies do not exist in a vacuum and they need water based medium for their continued existence. Disturbance in water balance is found in almost all disease but can we say that it is the cause? It may well be the effect. 

Primordial soup in which first organism originated  is presumed to be watery. Except for some scientists (Notably Fred Hoyle and Chandra Wickramsinghe) current consensus on origin of life presumes earth as cradle of life. Billions of years ago Life originated in the seas which contained all the necessary building blocks of life suspended in water. 

But water can be viewed as facilitator rather than cause of life.

For disease process water being the stage on which the whole intricate dance of biomolecule unfolds it definitely is a necessary factor.