I sometimes buy bottled water. Not because it’s better, but simply for the convenience package. But often I just refill a bottle and carry my own.
I understand your point, but one comment about gluten. Gluten is used as a food additive in some surprising places, as a food thickener, emulsifier, or just as a protein source.
This page shows a list including various food additives like MSG, modified food starch, vegetable protein, non-dairy creamer, caramel coloring, soy sauce, bouillon cubes, canned soups, chocolate, cold cuts, any basted or flavored meats or sauces, and medicines and vitamin supplements.
Here’s a shortened list from diabetes.org.
Here’s a gluten-free eating guide from NYU Langone Medical Center.
Ice cream, yogurt, cheese sauces, mayonnaise, soups and broths, and meat marinades.
Processed foods containing meat sauces and gravies are highly suspect.
So there is a reason for some products that you would think should have no reason to have gluten in them to, in fact, contain gluten. While I cannot conceive of a reason to add gluten to cinnamon, it is just on the side of conceivable that it is used in some spice mixes as a stabilizer or moisture clumping preventative.
Now that doesn’t mean that everything labeled “gluten-free” has a legitimate risk of containing gluten, and certainly there are plenty of people shopping gluten-free that don’t actually have celiac’s disease or food sensitivities to gluten. Still, just because that label is on something that normally isn’t made with wheat doesn’t mean it is ridiculous.