Eventually I found out that there was a SWAT team raid about 7 years ago which included tear gas canisters. 

Toss some mixture in the canister for guests to have choices!

But to dig the ditch, lay the canister assembly in gravel, and fill in the ditch for an exterior French drain?

I transferred spices to those magnetic canisters and store them on magnetic strips. 

I'll record videos of me doing stuff like emptying the dust canister on the vacuum and cleaning the filters (kids, remember, so I supply the vacuum!)

I would install automatic fire suppression canisters on the stove (about $60) so should someone leaves a pot boiling on the stove, a fire won't get passed that point (https://www.youtube.com/watch?

This eased my mind a bit as the fleas couldn't stick to it very well and since the this suit had the boots sewn into it there was absolutely no way for the fleas to bite me other than my hands or headThe canister looked like a flea circus by the time I was done.

@Douglas KrofcheckIf you have four separate units and wanted to install a central vacuum in each, it is possible each would need to be plumbed separately {for fire code reasons} - either back to a common mechanical room or within each unit - requiring a separate canister/motor to be installed for each.While a central vacuum would be a nice perk, I doubt it would be cost effective - it would likely be cheaper to finish all the units with hard flooring (no carpets) and buy a $50 Bissell Power Force bagless vacuum for each unit.  

The tenant used cutting board and had canisters sitting on it. 

Here's the list: liquid hand soap, paper towels, kleenex, toilet paper, plunger, blue paper shop towels, canister of clorox wipes, first aid kit, large garbage can, large garbage bags, flashlight, step stool, contractor's roll of paper for floor protection, handyman tool kit, bottled water for the crew, N95 respirators, hearing protection ear muffs, cleaning gloves, work gloves, safety glasses, cleaning supplies caddy, repair supplies caddy, inspection tools caddy, shop vac, broom, light bulbs.