Drinking Water

One of the first things we learned RV'ing is that the water in campgrounds can be horrible.  Some are just awful.
We use a filter for the water coming into the rig, but that filter is more to protect the hot water heater and the pipes.  We'll cook with that water, but that's about it.
During our summers out, we would use those 5 gallon Primo water recyclable water jugs with a dispenser.  But, at $6.99/5 gallons, it's hardly a bargain.
Now that we full time, we use two 6 gallon containers that we mule to one of those water filtration places you see outside the convenience store (Glacier is a popular one) and some RV parks have one set up.  At 30¢/gallon (sometimes 5 gallons for $1) it's a ton more economical than anything else, albeit not nearly the purity but much more consistent.  We still keep our Primo 5 gallon bottle, and they do wear out after a while, but it's $7 for one at WalMart empty, we just exchange it after a bit.