One can make this with bounties, but this is also bound to a lot of work, so maybe just working a normals dayjob and converting some of that money into BTC will be the best choice. I dont think that there are easy ways that give you a passive income of 0.1 BTC per week. But if you are creative there certainly are such opportunities.
It is not possible now, Maybe way back 2015- early 2016, it is possible. The price of bitcoin increase a lot, so the reward each time we you join a campaign will be lesser now. Bounties too, I don't trust them, and I don't want to be paid in new altcoin if I will do a task, it will just give me headache if I can't dispose it ( who knows if it is a shit coin).
If OP possess few bitcoins, well I would suggest to do trading, it will give him good ROI specially now that the price is so volatile that it drives like crazy.