Ironman Canada is 11 days away.... nutrition advice needed!

I'm doing Ironman Canada in 11 days. This will be my 5th ironman but I've had problems with nutrition in the past. This year I use only the Vega Sport drink in my bike bottles.It has worked great for me in training! I also use the Vega whole food energy bars on the bike. I make my own gel for the run (recipe from Brenden Brazier's book).
I live in Northern Ontario. I ordered 2 new cases of Vega whole food energy bars from our local health food store (some time ago) & they called yesterday to let me know they couldn't get any from their supplier. I don't want to change my nutrition plan at this point so I am hesitant to make my own bars since I haven't tried them in training. I'll be driving to Pencticton (leaving Kenora, Ontario) next Monday August 25th. Are there any stores where I can but the bars on the way? Also, for people out there doing IM Canada What is your nutrition plan for ironman? How often do you eat/drink on the bike & run? What will you eat the week (specifically the day) before the race?
Thanks for your help! This is all an experiment for me!!