I've been using my 2 liter diet soda bottles to save tap water as well. 

I know this goes without saying, but....this is an excellent topic and there are many great suggestions!
Anyone just starting to prep has a ton of info in this section. Let's keep up the good work!

Just revisiting this thread, awesome information here guys, thanks for all the contributions!

I ended up putting off the water bob since I came across the food grade 55 gal. barrels and had those filled.  However, now that I am back in an apartment, that's not possible.  Back to the BOB!    And guess what?  Free shipping on Amazon!  http://www.amazon.com/exec/obidos/ASIN/B001AXLUX2/?tag=2ahawaii-20

For how many I was getting, this was most cost efficient.  Aside from the BOB I am using a few 7 gal containers from Walmart, and re-using 1 gal and 2 liter containers (not milk jugs! they degrade quickly).  By the way, although the BOB would be difficult to dry out and says one-time use, if you do manage to dry it out I suppose it could be re-usable for non-potable water the next time.  Maybe. 

I like the suggestion of a tarp!  Along those lines, one could also use thick painters plastic.  Might pick some up next time I'm at home depot.  It could have other uses as well.

The one gallon plastic jugs that Arizona green tea comes are good for small stashes around the house, like under sinks and shelves. The plastic is pretty thick and I haven't seen any deterioration in the 4 years of using these.

The one gallon plastic jugs that Arizona green tea comes are good for small stashes around the house, like under sinks and shelves. The plastic is pretty thick and I haven't seen any deterioration in the 4 years of using these.

Hahaa yeah I use those too.   Target sells those ice teas for $3.

anywhere else to get these water bobs?

anywhere else to get these water bobs?

Strange, it's really difficult to find right now.  Just keep checking back on Amazon and the WaterBob site.

I can see KK filling it with beer.