Does anyone have any (preferably online) resources to trace the ~1800 sama verses in the original rig veda?

The Manu Smṛiti is mentioned in a lot of other scriptures, but it is not ever truly endorsed, unlike other scriptures. In the Manu Smṛiti, Manu says he got it from "the Imperishable One," which is a strangely ambiguous source. Is there anything in scripture that details the character of Manu? Is ...

Varunastra is a celestial weapon that unleashes water and is used as an encounter to Agneyastra, which releases fires and flames. My question is, how do you counter Varunastra?