Hold up on that $30 challenge, I think you overlooked that carrot and regret diet would actually cost more than $40. A bag of carrots is like $2.50 here and you'd need at least two a day to not completely crash, plus the regret is free but the electrolytes aren't. The real trick I found was that the soup and rice thing isn't just about savings, it's about not having to think about lunch for four days straight. That mental break matters more than people give it credit for.