I like to put lemon or vitamins (those tablets that also create fizzyness) in my water and have been wondering if it is problematic to do so in my aluminium drinking bottle. I wouldn’t normally think so, since soft drinks also often come in aluminium cans, but I’m not sure. Are aluminium salts even unhealthy?
Yes, there are health risks connected to aluminum bottles and acidic drinks. Aluminium is reactive to acidic drinks.
https://www.foodpackagingforum.org/news/health-risks-of-aluminum-fcms
Buy a stainless steel bottle. (Or glass or plastics)
Regarding the comments with the plastic coating: I don’t think that applies to bottles. Maybe soda cans. I’ve found this, but that doesn’t sound like a particularly good article:
https://www.isustainableearth.com/green-products/are-aluminum-water-bottles-safe