Here's my method for making standard/general notes:
I generate a valve schedule in paper space (or a second one, if needed), explode it, and edit. Because of the block thingy it used to be, it won't allow spaces in the title area (i.e. "General Notes"), so I just call them "Notes."
I'll then WBLOCK it and xref it back in, since these notes will often go on several plan sheets. Its so much easier to edit the xref, instead of multiple copies of the same notes.
I find this method fairly easy and quick, and it keeps that uniform look between all the various schedules and ref note tables.