I'm curious about where the huge quantity of old vodka bottles came from.
Follow your local regulations to the letter, even if they are wrong (chemically speaking). This is simply because
not to do so may result in very large fines, imprisonment, a possible local reputation as a baby-poisoner and all sorts of other hysterical weird stuff.
Fixer contains silver compounds that are bactericidal to some extent, hence the possibility of damaging a septic-tank etc. which work by bacteria disposing of the waste in the system. Most of the used fixer is water, so if you can work out a safe way (for passing thirsty animals) of letting that evaporate, your storage problem would be reduced.
Selenium toner can be filtered and replenished for years, there is no need to dispose of it every session.