I know your looking for stuff like Amquel but ammonia was always the least of my worries.
I am more concerned with pests like aptasia or broken equipment.
Joes juice/aptasia X
Phosphate remover
A spare 20g glass tank in the garage and an extra 37g plastic tub.
Lots of extra spare parts, for the pumps and hoses.
Silicone
Crazy glue gel ( to re-attach coral)
Additives like Alk buffer, liquid calcium and such (
always test first before use)
Edit:
forgot Lugol's
fish nets
RO water /prepared saltwater
Extra salt
Gel food..(Just in case because I got snowed in once and ran out of frozen food.)
Just ordered Lee's net breeder for the SH tank.
Most important..this site is my homepage so I have a whole lot of help in case of emergancy.
Good info. I noticed you wrote super glue gel for corals instead of the epoxy. Any particular reason?