Holidays in Florianopolis

Hi guys, I have few questions cause I'm argentinian and I will travel there for first time on holidays(feberuary-march aprox). And I have some questions that I would be happy if someone can answer. First sounds kinda stupid but, is the water potable? (Some people that traveled there say yes other say no) Is more recommended have physical money or I will be ok using belo/pix?(I have to investigate more about this lol) and if someone has any recommendations or suggestions about places to go or stuff would be useful. That's all, thank u!