Water Purifier (liquid) ( in a 4 oz bottle) almost 5 fl. Oz when full  -- No activator is included.

Chlorine dioxide has been used for 80 years by city water supplies,  travelers, camper and hikers as water purification for drinking water. 

NOTE: If you want it with an activator -- get the citric acid or buy a kit. Use lemon jusic for 3 minutes to activate.

Thanks!