Powering a fountain/filter for a container water garden?

This is my first time trying something like this. I’m making a 30 gallon half-barrel water garden with 2-3 goldfish, some aquatic snails, and appropriate flora (hyacinth, anacharis, parrot’s feather…). I would like a fountain and filter, but the closest electrical outlet is 50 ft away. I am trying to avoid the hassle of installing [...]