I am the same. Down to my last $20 and facing a choice to buy food or booze, I buy the booze without hesitation. I can handle hunger pangs much better than going without my 'medicine'.
Many of my benders actually ended simply because I ran out of money. Poverty will save me from drinking myself to death. Instead, I will probably have a long, drawn-out decline and die alone in a rooming house without a penny to my name. Unless, I stop drinking of course and live my life sober!!