Buy bottled water in bulk at Costco or Sam's Club and sell it for a dollar where there are a ton of people: parks, festivals, concerts, etc. People are crazy for bottled water and this is a little summertime gig that can bring in more money than you'd think on a hot sunny afternoon. Here's a bonus tip: give some of your proceeds to a charity you care about or that you know will resonate with people. In doing so, you're bottled water business isn't all about your profit. You're helping better our world and also provide a thirsty person some water to drink.
Websites like Survey Junkie will pay you a decent chunk of change for the low-maintenance, borderline mindless task of completing surveys. Companies want to understand consumers better, and one way they do that is by compensating survey-takers. Most surveys pay between $0.50 and $1.25, and many of them take less than 5 minutes to do. You can read our full Survey Junkie review for more info.