Until they starve to death
Their god is their way of survival, and that means food.
An adult praying mantis can only go a day or two without food.
Yes At least make sure they have access to it. The chickens will go to the coop about dusk as they do not wander about after dark. The coop is their "safe" place.
Yes, chickens cannot eat moldy food...
Chickens are a popular food source and are heavily bred to keep the chicken food source available in stores.
1 year
Chickens can eat all sorts or things as picking at grass. The food chain is that chickens are at the bottom with a lot of other animals.
Most free range chickens do not get antibiotics unless they are sick, sick chickens do not get eaten nor are their eggs used for food. Pesticides are only used when there is an infestation of mites in the hen house and then only in the dusting area where the hens go to have sand baths.
they can go pretty long without food but not to long without water
Until they are about 6 months of age, then they can go onto adult food.
You can put them together right when the chicks are old enough to go in the coop. They will meet the other chickens when they are ready.
They can go 3 days without food or water. But seriously, don't push it.