Hey I was up in the mountains outside of Yakima Washington a couple weekends ago. I ran out of water and used awuamira drops. I used the correct amount of drops and let it mix with the water and sit for 1 hr before I drank again. I have a separate lid for my yeti that I kept clean from the stream water. However since that day I have had an upset stomach. Can aquamira drops expire? What’s your experience with them?