Safest water bottle? (Heard aluminum is great and Sigg brand's mouth piece isnt functional) Alternatives?

Propell Fitness Water by Gatorade has a easy use top that you can twist open with your mouth, the bottle is pretty hard plastic. Certainly reusable, whether the label is taken off or not, plus the vitamins and flavour arn't half bad (the pink and purple ones not the lemon one), so if you want just the bottle or a flavoured vitamin water that would work. Its made for sports so it should work for whatever you need.