John Gill Commentary Numbers 15:5

"and wine for the drink-offering, the fourth part of a hin, shalt thou prepare with the burnt-offering, or for the sacrifice, for each lamb." — Numbers 15:5 (ASV)

And the fourth [part] of an hin of wine
The same measure with the oil, and this was wine of the grapes, as the Targum of Jonathan; other sorts of wine might not be used for the purpose mentioned:

for a drink offering shalt thou prepare ;
with the meat offering, to go along with every burnt offering and peace offering; which, as they were the food of God and the provision of his house, it was proper there should be of every kind fit for an entertainment, as flesh, bread, and wine. These were to go

with the burnt offering or sacrifice, for one lamb ;
if there were more than one, then a greater quantity in proportion was required.