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As soon as you juice, immediately pour the juice into the glass canning jars above, making sure you leave very little airspace at the top. Try to aim for about 1 mm of airspace. When you go to seal the jar, some of the juice will probably squirt out, which is good since it minimizes the airspace in the jar. Just rinse the sides of the jar. Refrigerate immediately. When you're ready to take it with you, opt for a freezer tote to keep your juices cool.
If it is necessary to use pulp-free juice, strain juice to separate any pulp that may have gotten into the juice. In a saucepan, bring 1/2 cup of water to a boil and then add 1 1/2 cup of sugar. Continue to cook over medium low heat until sugar has completely dissolved. Remove from the heat and add 1 1/2 cups of fresh lemon juice. Stir to mix thoroughly and then allow the mixture to cool.