Acetic Acid Water is exactly what it sounds like: a dilute solution of acetic acid in water. In the lab it works as a mild solvent for peptides that dissolve poorly in plain water, and it is a mixture, not a single pure substance.
Vestrand prepares it as a batched laboratory solvent, released with its own lot record that anyone can pull up by number.
One thing worth flagging: a quick database search on the name tends to land on glacial acetic acid — the pure, undiluted acid — which is a different material and should not stand in for this product. No authoritative source fixes a single standard strength for this solvent, so we do not assert one; the strength for a given lot is on its label.
For laboratory research use only. Not for human or veterinary use.