I actually do this, but as fat as I could investigate in historical documents, fasting means not eating until the evening. I also don't use alcohol on Wednesday and Friday. Even better is if you also only eat bread on those days, but I have to admit I am not that advanced yet.
The Didache also instructs us how to run a decentralized church. Which is why the document was hidden and not recovery until 1890 in the Roman church ...