Christopher tells JT he relapsed from sobriety by drinking wine when in fact he actually drank Vodka.
However, this is likely due to Christopher downplaying the seriousness of the relapse.
Even though J.T didn't have money to pay his debt to Christopher, he sold his laptop computer and other items therefore he would have enough money to buy enough heroin to become intoxicated with.
At Uncle Zio's funeral, as Father Phil gives the eulogy, it's very obvious that the "body" is still breathing.