Nothing.
If the Internet went away, we'd have a little time before batteries were not viable even if replaceable, as distributing those batteries would get problematic.
We would have had no time to withdraw cash as cash, an important thing since banks will fall over at least enough to trigger an economic collapse.
No, we're all gonna need to learn how to fight, and live without hospitals and drugs and probably electricity.
We have bigger problems than ensuring we can look up the capital of Rwanda on this cached Wikipedia while we listen to The Cure.