give up something for 40 days and 40 nights

I’m not religious, but the principle of lent still seems good to me. I’ll be:
- drinking more water, principally by drinking 1 glass of water for each other glass of drink I consume and keeping water on my desk and in my car.
- doing sit-ups regularly. I have been doing this each evening for a bit but I need to ensure it becomes habit.
- eating less rubbish. Because my current consumption is silly. 22 months ago