Toyota PRIUS Owner's Manual page 531

Adding distilled water
■
Remove the vent plug.
1
Add distilled water.
2
If the "UPPER LEVEL" line can-
not be seen, check the fluid
level by looking directly at the
cell.
Put the vent plug back on and close it securely.
3
PRIUS_OM_OM47A31E_(EE)
6-3. Do-it-yourself maintenance
LOW
531
O.K.
6