Water Bottles

Stainless steel (insulated) keeps water cold for 8–24 hours, is durable, and doesn't retain odors — the gym gold standard. BPA-free plastic is lightweight, cheap, and won't shatter — great for tossing in a bag. Glass is pure-tasting and chemical-free but heavier and breakable. For most gym users, insulated stainless is worth the premium.

Yes — quality double-wall vacuum-insulated bottles (Hydro Flask, Yeti, and similar) keep water cold for 16–24 hours and hot for 6–12 hours. The difference between an insulated and a non-insulated bottle during a hot outdoor session is huge. Budget insulated bottles (under $15) typically hold cold for 4–8 hours.

If you use protein powders, pre-workouts, or BCAAs: yes, get a shaker bottle. The wire ball or grid screen breaks up clumps that regular bottles can't. Look for leak-proof lids — most cheap shakers leak over time. For plain water, any bottle works fine.

Clean it daily — even plain water leaves residue that grows bacteria. For stainless bottles, wash with hot soapy water and a bottle brush. For persistent smells, soak overnight with baking soda and vinegar. Straw and spout lids are the worst odor-trappers; disassemble and deep-clean weekly. Dishwasher-safe bottles save significant effort.