I discussed this technique a while back. It offers passive income albeit sporadic. Recently I won my case against Google Plus. I have one more case pending - against healthcare giant Blue Cross Blue Shield.
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.
I smashed all the hussie-pussie in my extreme couponing post. They end up with a pantry full of things they will never use. The simplest way to save while shopping is thru weekly sales flyers, store rewards cards, and looking for managers specials as you walk the store!
But now they are wasting their lives by spending time on sites that pay about $5 per month. I gave up on the SWAGBUCKS and INBOX DOLLARS a long time ago. Even the survey sites pay slave wages.