It will be ok. RDWAHAHB. I would get some more whiskey like what was in the thing
or something mellow like crown royal...
and add it back to the barrel...keep moving it around...inside the thing until you are ready.
It won't keep forever like this but you should be ok for a week or so...
No campden for sure. and No sulfur strip! I would also refrain from using plastic to wrap it
as well...if the humidity raises inside the plastic it becomes a perfect environment for molds and
other bad things...Right before you use it, you could do a boiliing hot water soak to check for leaks,
the hot water will serve to swell the wood as well. Dump that water after no more than a few minutes
just to check for leaking.....immediately fill with your beer. Just my 2 cents.
read this...it is good advice....http://www.vadaiwinebarrels.com/index.asp?action=page&name=23
Edit: note that those instructions are for a new oak bbl...yours is already somewhat conditioned.
welcome to the world of " hey...I gotta brew....gotta keep my barrel full."