I asked this question a couple weeks ago at Ask an Apologist, but really want an answer sooner than they are getting around to it.
We've started attending a parish on an Indian reservation. Instead of wine, grape juice is used for the sacrament. I know it's supposed to be wine, but is grape juice alloweed in certain situations? If it is invalid matter, does that mean the grape juice does not become the Blood of Christ? If it doesn't, I'll stick to the Body only.
And I'd like documents please, if possible, not just opinions. We have on hand the CCC, the Vatican II documents, many encyclicals, & the GIRM. I'm sure I could find anything else on-line as long as I have the name.
Thanks in advance!