Parashas Naso · Passuk 6:15
a basket of unleavened cakes of choice flour with oil mixed in, and unleavened wafers spread with oil; and the proper grain offerings and libations.
Chabad.org — English translation + Rashi
Source: Nazir 45b.
English: “And their meal-offering and their drink-offerings” — Scripture speaks of his burnt-offering and his peace-offerings.
In context: The nesachim accompany the olah and shelamim, not the chatas; the midrash clarifies the assignment.
Custom
Chazal assign the drink-offerings to the olah and shelamim of the nazir, not to the chatas.