I have found some sucess getting products in Vernon. for instance, both health stores by safeway sell some products. Even safeway sells some sugar free e.d. smith items in jars like Jam and Syrups etc- so does the save on foods. Safeway sells sugar free sobe drinks.
Rogers flours mill sell a lot of the baking products you might need and they're open 7 days a week.
Purdy's now sell sugar free products and costco has rainwater sweetened drinks. or something like that I havn't been there for awhile.
Nutters is bringing in more products as they can.

Good luck with your journey. I am nearby.