A few days ago I made this for Porter. I got the idea here (from Pinterest of course!), and I thought it would be perfect for where Porter is developmentally right now. I put a bunch of different shaped and colored items in the bottle (mostly beads, and glitter), as well as water (I filled up the bottle halfway). It's awesome on hard floors, because it rolls around and Porter will army crawl around after it, therefore helping his crawling skills. He also loves to pick it up and shake it because of the noise it makes and probably the feeling of the water moving around in the bottle.

So cheap and easy to make!