I do not own a SPORT,but I played the part of a survivalist on a cable show.
Here is what I have seen to do: This bottle has a shelf life of 50 years. When the filter system will not be used for an extended period, flush the unit with a chlorinated solution of 1/4 tsp. per one half gallon of water. Allow to dry thoroughly with cap removed. Re-assemble and stow. Do not allow filter to freeze, do not place in microwave oven, and do not run hot water through the filter.
I would use two drops of non-scented bleach for an hour soak ,(or long enough to get into filter element)and then dump and allow the sport to air dry.
The Berky Guy should be along to give his advice soon.