Is there an approximation of how significantly alcohol will bring my blood glucose down?

I'm 6'0, 160, 20 y/o male, I'm newly diagnosed and plan on drinking for the first time tonight. Just cherry coke zero and vodka. My ratio that I'm rocking right now is 1:10 for carbs, and 1:20 for protein. I plan on starting around 170 and keeping glucose tabs with me, but what should I expect?