I have taken my "Make it at Home" philosophy to new lows, it would seem. I've started making my own scratch version of "Poo Pourri," the stuff you spray in your toilet water to prevent odor that results from "dropping a deuce." The for-sale stuff is not cheap and I can vouch that it works. At camp, we actually spray it after we flush to help keep the smell from the black tank in check. At home, it is used pre-poo. Well, I use it more than TBG, which is something I've got to work on!
You can find various formulations on-line. I tried one that used 20 drops of three different essential oils for 8 ounces of water. I found that it wasn't strong enough so I adapted it using a cheap find from Dollar Tree. For each spray bottle I make up, I use the essential oils (Lemon, Lemon Grass, Grapefruit) and half a bottle of a refill used for plug-in air freshening units. The scent is stronger and it's oil based. My latest batch added Mango into the mix.
A batch of my home-made poo spray probably costs about 60 cents to make. The store (or Internet) version would set me back $15 - $20. This is is a bathroom hack worth the effort.