Hoses not labeled safe for drinking contribute to lead and other dangerous chemicals getting in the water. Use the white non-toxic hose for hooking up to the water source and take along a green or black garden hose for all other uses like flushing out holding tanks or washing the RV. When you're not using the drinking hose, roll it up and connect the two ends together. This will keep dirt and other debris from getting in the hose. The next time you use it, run some water through it before hooking it up to the RV.
You then need to filter the incoming water with a high quality filtration system. Water filters do not completely purify the water, but they can control and remove bacteria, lead and other dangerous contaminants found in drinking water. Hydrolife filters use a filter media called KDF. It uses electrochemical oxidation reduction to neutralize harmful chemicals and bacteria. It also uses carbon to reduce pesticides, fungicides and other organic contaminants.
You basically have two choices on how to filter your RV water system. You can install an inline water filter directly to the water line that you drink from, or you can filter all of the water going into the RV, which is preferable. This helps to protect the entire water system and filters the shower water to help prevent any skin irritation.
