Kilz is OK but not as a primer on bare material. (There are bare drywall versions though) It has a nasty habit of peeling off in sheets.
The best stuff out there is BIN but it's quite pricey. One quart usually costs almost as much as one gallon of kilz. It's a shellac based primer so it uses denatured alcohol as the carrier. It dries fast too. Make sure to check the date on the bottom of the can as it does age quickly. It does not brush well but perfect coverage isn't as important as other primers so it doesn't have to be an even solid white when done, just covered.
There are specific aerosol mold killing primers that the commercial painters use on restaraunt remodels. Not sure the brand though. And yes there are additives to put in the paint. Dunnow how well that works in the real world hough.
As for environmentally best choice. Personally I will go for the product that will do the best job and last the longest. Even if that product has some nasty stuff in it or processing issues it's still the greener choice because it keeps the structure out of the landfill longer and you aren't rebuilding it. Basically the longer you can keep it in service the better it is overall. Just look at the big picture. Have seen too many use the "green" product only for it to fail and have to do it again which defeated the purpose.
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