I need a refill, far more than once every weekend
Mack is stating he can’t wait until once each weekend (When standard church services occur) to get his next fix. He needs it far more than that.
This line could also be referring to how his alcohol dependency has grown far past being a social drinker on the weekends and that he now needs a drink on a regular basis to support his habit. The liquor store has become his church. Alcohol has become his faith and it’s hard to just leave it.
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