Did they drink contaminated during the hike?, Did she remember to purify the water before drinking?, Did I buy a water purification tablet with me?, Did the local authorities provide cleaned water to the affected areas?, Did we check the water quality before using it?, Did we purify the water before drinking it?, Did the school install water fountains last summer?, Did they bring reusable water bottles to the picnic?, Did she forget to filter the water before making coffee?, Did the government supply clean water to the disaster stricken regions?,

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