Lemon juice also works. Carry several wet bandannas in a zip lock bag. Bicycle helmet, also help prevent baton bumps. Padding in sensitive areas if you might be fox trotting with a clumsy policeman. Speaking of padding, make sure you add insulation pads between you and the ground if you plan on sitting down.
Hockey pants work too.
Knee pads if you are fixing people or things that are low down. This should make you pee. If you are having such a swell time at your blockade that you simply can't skip out to the bathroom, don't pee in you pants. It is not chic and will only make you cold and miserable. You could wear a synthetic wick-away diaper.