Welcome to Ask Wirecutter, where deputy editor Annemarie Conte helps you figure out how to make the most of your stuff in real life. If you have a shopping conundrum for our advice columnist, submit it using this form or via Annemarie's Instagram, where she posts question prompts for you.Dear Wirecutter,Can mold grow in a Brita water pitcher in the refrigerator???PPDear PP, Your simple question about Brita filters has unleashed a torrent of my own follow-up questions about the proper care and use of these omnipresent water-filtering devices. (Brita has something like a 45% market share in the US, according to reports.)To lead us through the things that might be buried in Brita’s FAQ page — or that are not in there at all — I asked Tim Heffernan, our senior home-improvement writer who has been covering water filtration for Wirecutter for over a decade.But first, if you’re looking to up your hydration, I covered this topic in a previous Ask Wirecutter column. And I want you to know that you can fulfill your daily needs with plain old water as well as through food and most non-water beverages (including carbonated and caffeinated ones). Just not alcohol! It’s a diuretic.Now, Tim, give us all of that H20 knowledge!