Remember pay phones? Did you have to cart around quarters? I used to have to keep a stash with me at all times so I could call home when I was out on weekends with friends.
And bottled water, what did people do before bottled water? Use the water fountain? I wish more people did that now since plastic water bottles are everywhere and creating such environmental problems. But people keep using them because they're so convenient. That's our problem, we like convenience too much.