I was looking for a new toner and felt like fainting when I saw how much they cost these days! After experimenting (and let's not talk about how I burned myself trying to use straight-up apple cider vinegar), I came up with a recipe for nice little cotton pads soaked in my homemade toner. It's quick to make, cheap, and green, because I recycled a jar to put them in.
Rose water (from an international food market)
Cotton pads (got 'em at the dollar store)
Apple cider vinegar
Recycled glass jar
Pour rose water into jar until it's about a third of the way full. Add a splash of apple cider vinegar, not too much! It has malic acid which is good for exfoliating, but it smells and it can be too strong if you use too much. Then put the cotton pads in the jar and shake it all up to soak the pads.