I do not have a source of sawdust or similar material. Would leaves or leaf-mold work?
BTW: Sawdust alone is NOT going to cover up the smell of a “bucket toilet”!!! I did a test – I left my container uncovered in the bathroom, the poo completely covered in sawdust, and closed the door for 15 minutes. I opened the door and EEEK!!!
How long would I survive off the grid? Well, I might be OK, I'd be tempted to shoot myself perhaps. The computer wouldn't be much a problem, but not having the fridge and freezers and air conditioner would be really tough.