14 days of high temps, 1 to 2 tsps of salt per gallon, and 100% daily water changes should do it. :) Any tubberware will do that is roughly 1/2 a gallon or 1 gallon. If you want to make double sure it'll be safe, check the bottom for the number in the middle of the little recycle symbol. It should be exactly 5.
If you keep up with the water changes, he should be fine by the end of the 14th day. If not, let us know and we can go from there. :)