You drank half that bottle in one gulp! You really powered that back!
You really knocked half that bottle back fast, didn't you?
ーYou drank half that bottle in one gulp! You really powered that back!
「一気にボトルの半分飲んだね！すごい勢いだったよ！」
drink half that bottle in one gulp で「ゴクリと/一気にボトル半分を飲む」
power ... back はこの場合「勢いよく…を飲む」というニュアンスで使えます。
ーYou really knocked half that bottle back fast, didn't you?
「ボトルの半分をすごいゴクゴクと一気に飲んだね？」
knock ... back で「…をゴクゴクと飲む」となり、knock...back fast で「…をゴクゴクと一気に飲む」というニュアンスになります。
ご参考まで！
カナダ 
