Focus starts with hydration.
Even a 2% decrease in hydration has been showed to decrease levels of focus.

This 17-ounce, double-walled stainless steel water bottle is perfect to stay hydrated during the day. It will keep your water cold for hours, or your coffee and tea hot. It also features an odor- and leak-proof cap.

• High-grade stainless steel
• 17 oz (500 ml)
• Dimensions: 10.5″ × 2.85″ (27 × 7 cm)
• Vacuum flask
• Double-wall construction
• Bowling pin shape
• Odorless and leak-proof cap
• Insulated for hot and cold liquids (keeps the liquid hot or cold for 6 h)
• Patented ORCA coating for vibrant colors• Hand-wash only (dishwasher not recommended due to vacuum seal)
• Blank product sourced from China

Disclaimer: Keeping water in the bottle for over 24 hours is unhygienic and can result in an unpleasant smell.