I think it's pretty obvious how it will be paid for. It doesn't need to be written into the bill. You are focusing on minutia, which is distracting you from the big picture.
It is "obvious"? Is that how laws are written?
Not a single person can be covered under Bernie's plan because none of those services are paid for. For examples of how well unplanned for changes in government programs go, look no further than just about everything Trump has tried to do.
350 million people depend on a smooth-running healthcare system. Though we support single payer universal healthcare coverage, most people don't support Bernie's bill because it doesn't include the kind of details needed that would make for a well planned change to a single payer system.
You keep arguing for universal healthcare coverage and most in the US agree it is needed. With that kind of political mandate we expect more than the unfunded medical care legislation that Bernie submitted to the Senate.
Bernie's medicare for all bill is typical of "fake it till you make it" hucksterism. Most people aren't taken in by that. Some are.