And one goat as a sin-offering, besides the continual burnt offering, its grain offering and its libations.
Torah Temimah: Taanis 2b
English: It was taught: R. Akiva says, it is said on the sixth [day] “and its libations” — the verse speaks of two libations, one of water and one of wine.
Dual libation language on day six.
Water and wine are both required on that day of Sukkos.