I liked this episode, although I didn't care for Raph getting turned into a sort of plant-like creature. Maybe just have him being stuck inside the Creep instead?
As for others wondering how the farmhouse had electricity and water, the family likely had a generator stored out in the shed whenever there was a power outage, and that's how it is running the place. Alternately they could be using Kraang power crystals too.
As for water, nobody here has heard of pump wells to get groundwater? That's what many people use when they aren't tied into the waterline of a town or city.
And the chickens? Sometimes you can buy laying hens from a local farmer. Casey and April likely went to get them, and buy the feed in town.