The best way for a steady income, especially when it comes to Bitcoin, is to probably join a signature campaign and always cap out whatever the maximum number of posts a day/week/month is, that way you get a relatively simple and consistent income directly in Bitcoin. Now that doesn't fit your criteria of not doing anything, so that's out of the question.
One potential idea is investing in a casino bankroll and get paid that way. I haven't done it in the past but with enough research I think you'd probably have a good idea of how it would all work.
I agree, Signature campaign is a best way for steady income, You can do it full time or part time as an side job, youll have a steady income for a week or a month it depends on what is your project or working at. Or you can invest your money on a business that is in demand in todays life, whether its a food or material business.
No business will give you steady income and in the beginning stage you may also suffer loss from it and to make money from business you should have patience as it will take time to build a reputation in market and there are many factors that will be responsible for the success or failure of your business, on the other hand signature campaign will give you steady income till its operating and you never know when it will stop paying to its participants.