Reusing water bottles, plastic or otherwise is a popular way to be eco-friendly, but one of the big problems with water bottles is mould build-up. The word ‘bacteria’ can send many people reaching for the hand sanitiser, and while some bacteria are not harmful, it is probably better to be safe than sorry and keep your water bottle clean.
Playing consistent golf all the way through a round has a lot to do with being able to maintain concentration. Maintaining concentration has a lot do with keeping energy levels up. Keeping energy levels up is all about food.