ltt spout lid for water bottle
I don't drink tea, but I do have one of the old 21oz water bottles and a spout cap to go with it.
The spout lid is made out of black plastic, and there are two clear rubber seals: one between the lid and the bottle and another on the underside of the spout cap. (The cap says it's food grade polypropylene. I'm not 100% sure what material the seals are made of, but to me it looks like silicone.) The spout also has a single turn thread inside, which the thread inside the cap engages when you tighten it.
If anything's going to hold onto tea residue, I think it's going to be the cap threads and seal. Either wash those thoroughly, or get an extra lid so you have one just for water. I don't think the plastic will discolor, but the seals might.
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