The best stainless steel water bottle can save you a lot of money, deliver a delicious hydration experience, and protect the planet all at once. It’s time to invest in your health with a new stainless steel water bottle! Water is the most important liquid on earth. It’s the source of virtually all life – and it makes up over half of the human body. An essential ingredient in everything you do, water helps to regulate your body temperature, support digestion, and get rid of toxic waste in your system.