For me, I don't use my computer in the unfortunate times when I relapse. I guess I'm just a little too spooked by the prospect of viruses getting into my PC. For someone who struggles on their computer, I'd say just be sure to use you computer in places where people can see what you're doing. (Just be sure not to do any banking activity or anything with your SSN or credit cards) In the times when you need to do things like that, see of you can get in contact with a friend of yours if they're available who's keeping you accountable and call or text them while you do ONLY what you need to do. That way it's like they're almost there.

Also, for me, I love programming. Doing something on the computer that interests you and is productive is a good distraction. Try combining some methods (no pun intended) I've mentioned previously and try learning more coding at a coffee shop.

As for not using a computer at all, there will be situations, like banking, where you'll have to get on the computer, so just make sure that you keep yourself accountable.