Science Weather Unit

We started our weather unit in science today.  I am excited, because weather is one of my favorite things to teach.  There are so many activities and projects that go along with the topic.  One of the things I want to do is make rain gauges for the students to take home.  I can make them out of 2 Liter soda bottles.  The only problem is, we don't drink soda in my house and we certainly can't drink 17 of them by Friday.  If you would be willing to save your empty two Liter soda bottles and send them in with your child, that would really help me out for next week.  Thank you!