I've been using the same plastic drinking bottle (one of those Tritan bottles) for about a year now, and lately it's been turning yellowish on the inside, even though I rinse it regularly. Is that normal or is the material breaking down? Is it still safe to drink from?
Rinse the bottle with hot water and a bit of vinegar or baking soda - usually it's just discoloration from tea, coffee, or mineral deposits, not the material itself. Tritan is pretty stable and doesn't normally just break down, even after a year. If the discoloration goes away after that, you can use the bottle without worry; if it's stubborn or the surface gets rough, I'd swap it out then.
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