Best swimming device for a one year old?

In your opinion, what is the BEST swimming device for a 1.5 year old? To be totally clear, I have done my research on puddle jumpers and that is simply not an option. My daughter also will be in yearly swimming lessons until she masters swimming, her first lesson will be in June… I am just looking for the best life jacket or device that is safe while we are in or around water, especially while camping. She loves water, and although I never plan to take my eyes off of her, drownings happen in a blink of an eye. I will also ask her pediatrician on her thoughts/recommendations. TIA!

We always used SwimSchool devices. They come in steps based on age/ability.