It's the FIRST drink or drug that gets you wasted, not the third or the 6th or the 20th. You know if you pick up the first one, you will want MORE. This is a disease of MORE. Even if you have one, your will power will only work to delay the next one, not prevent the next one. Plus, one drink is certainly not going to do what you want. It will just increase the craving. If you pick up the first one, the terrible chain to disaster is inevitable.
Today I will not pick up the first drink or drug. It's OK for me to know I cannot pick up the first drink or drug without HELP. So I will call someone if I get a craving and I will keep working a strong daily program even if I don't have a craving to relapse because this is my relapse preventative medicine.