PVC is the industry standard for water piping, even for your drinking water. There is also high temp PVC for hot water apps. It's very difficult, at least in my experience, to find HDPE piping. I haven't heard too much concern about leaching in PVC, mostly about how nasty the stuff is to manufacture.
If you are worried about strength either get a thicker pipe or there is also ultra high density polyethylene, but for piping its probably rare or cost prohibitive.
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