ここ2、3年 - in the last 2 or 3 years (technically slightly different)
ビエトが - Viet (as the subject)
一日に飲む - drunk in one day
一日に飲むお酒 - alcohol drunk in one day = daily alcohol
かなり増えてる - increase significantly
んだ - explanatory のだ
よね - right?/emphasis/flavor
“Viet’s daily alcohol amount has significantly increased in the last 2 or 3 years, right?”