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BuildLife Gallon Motivational Water Bottle ($19)

For the really thirsty water drinker, this gallon water bottle ensures you're set for drinks for a while while on the go. The bigger size is ideal for someone who will be out for a full day or more, and it even has motivational phrases to encourage you to stick to your water intake goals. It's a little heavier than some other bottles because it holds so much water, but that's an easy trade-off for some people.