Yeah that is really far out there. I'm guessing the closest real town or city for shopping is Lillooet? 5 hours to get there and 5 hours to get back...
For us, Williams Lake is the closest town with supplies. We travel in a generally northerly direction via various 'tracks' to we turn onto Chilko Lake Road, which ends up on Tatlayoko Lake road, which will in turn lead to Hwy 20. From there, it is all paved to Williams Lake.
Distance wise is not obscene but the 'tracks' i refer to can be a pain to maintain due to wash out and tree blow down etc. If that is the case it can significantly add to travel times. Winter can be good and bad depending on amount of snow or icy conditions etc. Typically, up until about January, winter driving is actually easier IMHO, as all the potholes/ditches are filled out. We use heavy duty chains on the tires if it gets too slippery and/or too much snow, this can make for a really long drive due to having to travel much slower with chains on.
There is no cell reception, we have satellite, the ISP here in Canada is called Xplornet, which I believe uses Hughesnet. Download speed is pretty good, streaming services typically work fine with SD, voice comms. can be a bit of pain with the 700ms latency. Since covid-19 with many more people working from home etc. I have noticed a significant drop in bandwidth and how spikey latency can get at times