I never measure anything and just eyeball it when making manure water for agar. But I put something together that I know will work fine.
Pour 500 mL of water (my measuring cup was only 250 so I doubled it) in a pot:


Add approximately 200-250 mL of manure (in my case I use Black Kow) to the water:



Then bring the water/manure mixture to a light simmer for 10 minutes:

Then strain with a fine colander into another receiving vessel:

Now you have manure water for your agar:

If 500 mL is not there after the simmer and strain, just add more water until you get your desired amount for your agar recipe.
Works very well for me anyway.
Edited by peacefrog, 03 May 2018 - 03:26 PM.