Making and Storing R/O Water

I'm off to get a big ass (45ish gals) tub to store my R/O water. As
Mark suggested (Tanks Mark!) I'll make sure its marked LPDE

I want keep the water for few weeks, would an airstone (say two off an
Elite 802) better or would a powerhead (say an 802 with the air hose)
be better? Suggestions appreciated Also, thanks to all re the Berlin
and the venturi question. I took the Berlin venturi out and the Kent
is working great. Lots of foam, brown/black nasty stinky ****e being
kicked out :-P