Yes you can! During loading, essentially there are not rules about what you can’t eat or drink. It’s only once you are on the VLCD – very low calorie diet, that things become super strict and at that point avoid alcohol like the plague!
If you are asking this question you no doubt have some specific time you’ll be loading where alcohol and other things will be there but I just want to throw this out there, if nothing else but for a future round, which is the idea of cleaning loading for the hCG Diet.