You can get a boombox with bluetooth https/www.amazon.com/Sony-ZSRS60BT-Boombox-Bluetooth-Black/dp/B06XZ4PB5B
But not a waterproof one. All the ones that come up in searches are waterproof bluetooth speakers without built in radios.
The Denon Heos 1 speaker has an optional battery pack. https/usa.denon.com/us/heos-1-portable-wireless-speaker
It doesn't have a built in radio but since your phone can just act as a remote and it can do internet radio it will work great for you. You can even get more than one for stereo or to cover larger areas,
Ultimately if you want the best quality then you would use a Denon Heoslink plus power amp or HeosAmp with wired speakers (Revel or Sonance). This would give you the best sound quality with the...
You can get a boombox with bluetooth https/www.amazon.com/Sony-ZSRS60BT-Boombox-Bluetooth-Black/dp/B06XZ4PB5B
But not a waterproof one. All the ones that come up in searches are waterproof bluetooth speakers without built in radios.
The Denon Heos 1 speaker has an optional battery pack. https/usa.denon.com/us/heos-1-portable-wireless-speaker
It doesn't have a built in radio but since your phone can just act as a remote and it can do internet radio it will work great for you. You can even get more than one for stereo or to cover larger areas,
Ultimately if you want the best quality then you would use a Denon Heoslink plus power amp or HeosAmp with wired speakers (Revel or Sonance). This would give you the best sound quality with the same functionality.