Hi, BJ. I'm Edmontonian number three.
I did a very similar thing a couple years ago -- six months cycling through Europe shooting Velvia. I was going to bulk-roll, but then I discovered it's actually cheaper just to buy pre-rolled from B&H in New York.
B&H will sell you a 20-pack of Provia 100F for US$83.80 (that's for imported film; it's US$89.80 if you buy the official USA stuff, but unless you have a fridge in your backpack, it won't make a whit of difference). Plan on about US$30 for 3-day courier, no matter how much film you order, which means a total of CDN$148.63 for 20 rolls after currency conversion, shipping and GST. Obviously, the price goes down considerably with every extra roll, since shipping is a major component of that.
But even with only 20 rolls, that's CDN$7.43 per proper roll of Provia 100F.
And note that it's exactly the same price for the 20-pack as for individual rolls at B&H -- US$4.19/36exp for the imported stuff. It's just easier to buy the 20-roll pro-packs.
So presto, now you have official rolls for a buck a pop cheaper than bulk-rolled.
The other reasons I recommend that route are 1) you don't have the extra weight of the bulk roller, 2) you'll invariably get a lot of grit in your backpack, so reusing bulk canisters is just asking for scratches, and 3) with your plan, you'll need to develop your film along the way. That's not a great idea because the quality of E-6 processing varies widely. Phil Greenspun has some horror stories about street-corner European labs botching E-6 at photo.net, whereas in Canada, since only pro labs will deal with the stuff, the quality is much more consistent. Also, if you develop it there, you have to worry about keeping the slides clean, worry about them getting stolen, and worry about the accumulating bulk and weight (which is significant when you're talking about dozens of rolls).
Instead, I would mail your film home periodically. I mailed every roll home on its own because the Edmonton Journal was running some of the pix and they needed them as soon as I was done with a roll, but you'd be fine sending maybe five rolls at a time to save on postage. I lost one roll out of 37 in the mail -- the envelope showed up, but it had torn open at some point and was empty. Maybe send 'em home often enough that you can afford something secure like UPS. I just used regular mail, and as I said, all the envelopes showed up, just not all the contents. (The empty envelope was just plain paper, not padded or anything, because the rural Irish post office had nothing better.)
Good luck and have fun.
