I can relate to you both.
I was seven months sober, and was at the laundromat. Convieneince store sold beer. Picked up a twelve pack and was back at it full bore in no time.
Never give up trying. I now have 25 months and a drink is the farthest thing from my mind, as long as I keep my house in order. I get a daily reprieive. And for that I am grateful.
Start again! There's no use beating yourself up over it.