Can you add flavored packets or loose tea to the bottle? April 22, 2019 19:25 No, only water should be used in the bottle. Any additive to the bottle may actually clog the filter. Related articles Does this filter purify saltwater? Which of your products are TSA friendly? Click here for the Performance Data Sheet 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.