As the previous poster said, 13 days is not very long. Beers very rarely ferment exactly the same. Even if it was the exact same recipe, with the same abv, at the same temperature carbonation time would likely be different.
I bought a CO2 tank at Harbor Freight in Topeka, and had it filled at Drop Zone(a paintball store) a few years ago. Probably not open on sunday, though.
It'll be fine. The general rule is to wait at least 72 hours before worrying about your fermentation not starting. To answer your question, no. Unless the topoff water was boiling the chances are very slim that it killed your yeast.
A pound is a lot. I won't say not to do it, but i think your results would be pretty similar using half that. A pound of hops is going to soak up a LOT of beer, too.