Can you add flavored packets or loose tea to the bottle? April 22, 2019 19:25 Follow No, only water should be used in the bottle. Any additive to the bottle may actually clog the filter. Related articles Which of your products are TSA friendly? What’s the difference between the annual plan and the pay as you go? Can I buy a filter without signing up for a plan? Can I use this filter to drink out of a stream/lake/outdoors? Comments 0 comments Article is closed for comments.