If you’re dehydrated, drink plenty of fluids: water, diluted squash or fruit juice. These are much more effective than large amounts of tea or coffee. Fizzy drinks may contain more sugar than you need and may be harder to take in large amounts.
Source: Dehydration @ NHS Choices
Image: Water Impact 0 by (Henningklevjer) - (Henningklevjer). Licensed under CC BY-SA 2.5 via Wikimedia Commons.
