Bottles of Water

Our financial week begins today.

I've decided I'm going to present the question each week to myself and my husband, "what one thing will you do to save money this week?"

I just read through The Frugal Graduate's bottled water post. 

She poses a very interesting question about banning small bottles of water. I stopped buying bottles of water a few years ago but I have been purchasing gallons of water (very cheap) here and there over the past year or so. This week (and from here on... with tiny exceptions like if I'm visiting Guatemala) in order to save money I will not purchase water for myself. I have nothing against tap water. It's pure laziness when I buy water. I just need to make sure to bring water to work with me. At most I think I spend $2.64 on gallons of water each week. BUT that's $137 a year. Uh, I think I can drink from the tap from now on.

What one thing can you do to save money this week?