My daughter has herpigina blisters for about 5 days my son sipped her water bottle will he get it ?

Probably: Herpangina is caused by coxsackievirus & is very contagious through saliva & fecal matter (importance of handwashing after toilet use). Also called hand-foot-&-mouth disease due to those areas being affected with the blisters. If fever is present, give fluids to prevent dehydration. Disease is usually self-limiting but see pediatrician if child complains of severe headache or chest pain.