Get one of these, or make one. It’s just a little tank into which you pour the appropriate amount of bleach and then use your hose to flush it into your water system. They are cheaper directly from the manufacturer but if I wanted another I’d make it out of a few PVC fittings and a short length of 2 inch pipe.
https://www.amazon.com/RV-Inline-San.../dp/B08F2QTQ5T
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