I've found that a little bit of carbonation helps to make a beverage more refreshing. So, club soda, to me, is more refreshing than water.

Also, iced teas tend to be more refreshing to me, especially if there is a little bit of squeezed lemon in them.

My Mister swears by an ice cold cola (coke brand) after a hard day of working in the yard, mowing the lawn and suchlike. Normally he drinks diet soda, but he says that there is something special about a fully sugared soda after a hard day's work.

If you really want to get unique, back in the day (middle ages Europe) they used to mix water with strong vinegars. Possibly carbonated water if you have it. Modern tastes usually require a little bit of sugar or honey to balance the bitter flavor.

What I'd suggest to you is club soda with lemon, possibly tonic water (has sweetener and a bitter additive), or on occasion, a regular soda.
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I would say Iced Tea. Try some Lipton.

http://www.lipton.com

Another very refreshing drink is Lemonade or Vitamin Water Power-C

http://www.glaceau.com
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I got bored with the everyday beverages so I started making my own. Here in Hawaii, we have something called Luau artificially flavored syrup. It comes in orange, grape, fruit juice and passion fruit. I put 4 ounces of this in a quart container. Then I add water to the 32 oz. line. Then I add two cans of soda. I usually put fruit punch soda in with the fruit punch mix and so on. However, one combination that I like is grape mix and apple soda. This is really good. Since then, I have used blueberry pancake syrup to make a juice and I have located banana syrup and watermelon syrup. The last two syrups were designed for shaved ice or sno cones. I put these concoctions in 8 oz plastic bottles and leave them in the frig until they are cold.
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One of my favorite in the most refreshing category is Minute Maid from concentrate LimeAde. It is also really good with crushed ice. Sort of a virgin margerita.

Love it - it's different and hits the spot.
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