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If you’re marching on Saturday — and you should be — start hydrating now. If you can, buy a CamelBak or platyhydration pack. And be prepared to use lots of sunscreen NWSChicago/1012293227687370752
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This is especially true if you’re fasting on Sunday. (Not my personal practice, but many will be en.wikipedia.org/wiki/Seventeenth_of_Tammuz)