This is Optimizer, a weekly newsletter sent from Verge senior reviewer Victoria Song that dissects and discusses the latest gizmos and potions that swear they're going to change your life. Opt in for Optimizer here.
Europe is melting, the eastern US is currently trapped in a "heat dome," the Midwest has the corn sweats to look forward to, and if you've never felt the oppressive, sticky misery of monsoon season in Asia - consider yourself blessed. But as folks duke it out on social media about who has it hotter (and whether air conditioning is ethical), it's time to address a nonnegotiable truth of surviving summer: hydration.
Surely, stayi …
DW Deutsch 
