Maybe Serratia marcescens, a bacteria found in soil, on animals, and on food, pretty much everywhere. It grows especially well in toilets, on tub wall, on food, on laundry, in ice machines, etc. It loves to eat shampoo and soap residue in bathrooms for the phosphorus they contain. It leaves a pretty pink, pinkish orange or orange red stain. You live with it every day all day. It's the pink slime in your dog's dish, your shower, and your toilet.

Fun fact: it is in the same family, Yersiniaceae, as the Black Plague, but with nowhere near the result.

Or maybe someone dropped a red Jolly Rancher, and the ice is coloured by that.

Probably one of those.

He wrote a line for just such an occasion:

I don't tell the truth, I tell what ought to be the truth. And it that's sinful, then let me be damned for it! ^Blanche ^Dubois

I have celiac, and knowing that it is gluten free keeps me from calling the company or writing them emails. It's sort of dumb, but not dumb. Before GF standards came out under Obama, there was no standard and companies didn't want to risk calling their products GF. Now it is anything under 20ppm, I think.

The vegan thing is probably more for Jewish and Islamic people, because they can't mix meats with certain foods (dairy is one, iirc), but probably vegans, too.