I'm not so sure about the safety of ABS pipe. Admittedly pumps etc are made from ABS, but there may be an issue of quality/purity/adjuncts etc. compared to sewage pipe grade ABS.

AFAIK Plumbing code prohibits the use of ABS for potable water. For potable water it is necessary to use PVC or Polyethylene (i.e. PEX). Likewise for medical grade it is necessary to use CPVC.

Why take the risk? Use PVC like everyone else does. It's tested and predictable.