Using running [Zochalin] water: Nedarim 40a-b
Using the Euphrates River as a mikvah: Nedarim 40a-b
Using the eye of a giant fish as a mikvah: Zevachim 22a
Which seas/oceans qualify for use for Mikvah: Shabbat 109a
Liquids from which one may not make a Mikvah in the first place, disqualify a Mikvah when they alter its color: Shabbat 144b
What happens if 3 Log of drawn water, with some wine mixed in, fall into a Mikvah: Makkot 3b-4a
What happens if 3 Log of drawn water fall into a Mikvah, but from so many separate vessels that no vessel held as much as a Log of water: Temurah 12b
What happens of dyed water falls into a Mikvah: Eruvin 29b; Makkot 3b-4a
Whether beet-gravy is water, to disqualify a Mikvah: Shabbat 144b
Wine, vinegar, and a fruit's non-juice liquid ["Mocheil"]: Shabbat 144b
What happens if liquor falls into a Mikvah: Eruvin 29b
Counting liquid clay as water, for all or part of the 40 Seah: Succah 19b; Zevachim 22a
Whether red worms count toward the minimum amount of water: Zevachim 22a
Including drawn water, so long as the greater part of the 40 Seah comes from rain water, and the drawn water flows into the Mikvah and is not poured directly into it: Temurah 12a, 12a-b
Making a whole mikvah out of water which is drawn, but is then let to flow into the Mikvah [This method is termed "Hamshachah"]: Temurah 12a-b
Status of a mikvah which is precisely 40 Seah, and then one repeatedly adds a measure of invalid water and removes water in the same measure ["natan se'ah v'natal se'ah"]: Zevachim 22a
Using a hole in the side of a mikvah, into which water from the mikvah occasionally flows, but which is not directly connected to the mikvah water: Zevachim 22a