Strange question.

Are you going to be traveling somewhere particularly hostile? If so why?

FWIW: Nowhere I have toured would I feel the need for pepper spray to protect me from people. If I needed it for self defense I would be carrying it at home since I am sure the need would be more likely than in the rural US where I tour. I carried and used Halt! on the TransAmerica because someone who was finishing their trip gave it to me, but I can't say I find it to be a necessity anywhere we were and probably wouldn't bother if I had to find a place that sold it and buy it.

The dogs in Missouri and Kentucky were a nuisance at times and good sport at others. Halt! was handy with a few of the most aggressive dogs, but we would have been fine without it. Merely brandishing the can was sufficient in most cases. My daughter sprayed them with her water bottle and seemed to get almost the same result.

To me, protecting yourself from people with pepper spray in a rural setting seems unlikely to be either necessary or particularly effective. In an urban setting, say a parking garage, it may buy you the necessary seconds to get to a more public place or into your car. In camp out in the boonies after you spray someone you will still be there as will they, only now they will be really ticked off. I would rate you chances that it would do you any good about on a par with the chances that it would get you into deeper trouble with an attacker or maybe get you into legal difficulty.

I am pretty sure that most people from urban or suburban areas are in more danger from the sort of thing that pepper spray would help with at home than on tour. Do you carry it at home? If so carry the same thing on tour. If not you probably don't need it on tour either.