The most common way to get head lice is direct head to head contact, as when little girls with long hair are playing together. Lice can also be on headgear, and travel from one person to another when things such as combs or caps are shared, or stored in really close contact. Head lice prefer clean hair, and are not a reflection on your personal cleanliness any more than getting bit by a mosquito is.
If someone get head lice there, it was more likely from the close contact with others. Lying on a towel at poolside with heads close by, or from towels, clothing being thrown in a pile together, or near each other.
Probably not. When head lice are deprived of oxygen, as when they are in water, they cling to the hair shaft and their system shuts down. They do not let go and float to someone else's hair.
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