I take a gallon jug of distilled water and mix it in that. I believe it is 1oz for 5 gallons so I do 1/5oz per gallon jug. That will usually last me months without it going bad. It lasts a long time. I will then fill my spray bottle using the mix I Just made. No need to figure out tsp or Tbsp this way.
Primary: S'mores Stout
Kegged: Centennial Blonde, Dry Stout and Orange American Wheat