Ok I love essential oils but have not used with chickens. Rosemary seems like it would be a good addition, just thinking, but i have a rosemary plant so I may just use that at the moment.
Let me ask for clarification here: How much oil of oregano? Just confused by post. Do you add it to acv ? and then acv added to water? A tablespoon of EO? Seems like a LOT, have to say...just checking...
Also re: algae (haven't tried this but I may) you can put 1/4 to 1 cup of cornmeal in a piece of nylon hose, tie it up and float it in the waterer. I did this in my parents ponds last year, seemed to help. Copper pennies are another trick.