For those who have never wormed or are contemplating worming; if your chickens feet touch the ground, they will get worms.... eventually. As I alluded to in post #7, it is not necessary that chickens will show "signs" of having worms. Your chickens can have worms without them showing up in poop. If you see them in poop, it means your chickens are infested and there's no more room for them inside their innards. They are also laying thousands of eggs to be deposited on the soil ready to infect and reinfect your chickens. To stop the worms' lifecycle, you should worm twice...an initial worming, then followed up 10-14 days later with a different wormer to prevent wormer resistance. Then set up a worming schedule that is suitable for your environment ie...once a year, semi annually, quarterly, every 9 months etc...it's up to you how and when you want to run your program.
Apple Cider Vinegar (ACV) is an acidifier which helps in calcium absorption and lower gut PH to help with bacterial issues. It is not a wormer.
DE doesnt work when it is wet, only until it dries. It is not a worm preventative nor a wormer. The insides of chickens innards are wet, therefore DE wont work.