Scenarios:

John is hiking the Lone Star Trail in Texas and is worried about pesticides from agricultural run-off. He is taking the S1.

Larry is a youth pastor taking a team to Fiji and is staying in a hotel. He wants to make sure his team is drinking safe water so each person is carrying an S1.

Andrew is going on a paddle trip in Mexico to a region with a known Rotavirus outbreak. He taking the S2.

Sally is traveling abroad and is concerned about industrial pollutants in the water. She is taking the S3.

James is prepping for a natural disaster and wants a filter he can use in case the water supply is contaminated so he chose the S3.

Jane is working at Dadaab refugee camp in Kenya and is worried about hepatitis E contamination so she is using the S2.

Sally is traveling abroad and is concerned about industrial pollutants in the water. She is taking the S3.

James is prepping for a natural disaster and wants a filter he can use in case the water supply is contaminated so he chose the S3.