I think the best and steady income in bitcoin is to have bitmain miner s9 is a
good idea to have and i think you ca get your capital money when you was buy a miner..
and tools.. this is i think the best steady earnings than the other activity..
This is the best for OP to know since he stated that steady income but without actively doing anything, no trading/gambling/loaning indicated you just need to have miner at home.
You need to be little careful in it. Wait until you reach your limit and get whatever amount you want as long as your miner is not giving up or over heating.