John,
Section III Step 4.3 states "If using Distilled white vinegar (5% acidity) add to spray (or wash) bottle and fill 1/2 to 3/4 full." You fill with just distilled white vinegar - what you buy in the grocery store should be labeled distilled white vinegar such as:
NID = Non-Ionic Detergent (Appendix B is a LIST OF ABBREVIATIONS & ACRONYMS) and is just a quick abbreviation used to identify any of the listed non-ionic surfactants such as Tergitol 15-S-9.
Take care,
Neil
PS/The document has a search function and there is drop-down menu (if you open the document with Adobe the icon is on the upper right) listing the chapters that allows you move throughout the document quickly.