Always having a water bottle with you can be helpful for remembering to stay hydrated. But should you be limiting the number of refills a day? Experts weigh in.

For about 45 years, the Nalgene water bottle ruled supreme—its heels nipped maybe by bottles from Contigo and CamelBak, plus numerous sport bottles, but still the irrefutable leader.

French startup 900.care wants to try something new. Instead of buying a new bottle of shower gel every time you need some shower gel, the startup focuses on the active ingredients.