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You don't need to be constantly giving your chickens medicines, even natural medicines. Especially you should never give them anything in their water without giving them a second waterer of plain, pure water with nothing whatsoever added.
Imagine if you never had anything to drink but Gatorade.
Also, there is no need to routinely deworm chickens. IF -- and that's a big IF -- the problem ever arises you can treat it then. Routine deworming only creates resistant strains that can't be treated when the need arises.
All your chickens need for good health is high-quality feed of an appropriate formulation for their age and laying status and pure, fresh water. Because many of us here have mixed flocks of different ages or sexes, we usually recommend an 18-20% protein all-flock feed with free-choice oystershell on the side for the laying hens so that they can manage their own calcium.
If you're in the US where it's available, I'm currently using the one from Nutrena Country Feeds, which is about $5/bag less than the Purina. My flock loves it and their molt is going smoothly.