I just want to be on record as agreeing with the Doctor on this
one.  This is the only time I believe I will be consuming forbiden fruit
as part of a very specific ritual.
        I'm also working from memory here.  If I can get away with it, I
will use a more natural beverage.  The cherry coke is only used because
of its association with the thoughts that need purging.
        In general modern religions will be easy on you if you explain
that your immune system can't handle this or that.  I was able to get
water when I was a guest at a Wiccan ritual in Spring, and they had about
10% of the cups in the tray devoted to lactose intollerent people who
could drink milk and honey.
        Right nnow I'm looking into whatever natural substitues I think
will work well.