Youtube fish enthusiast ThinFrog shows us how to create a simple aquascape for a betta. Using lava rock and a small branch-bound plant, you can have a tank up and running quickly.
Betta fish have a special respiratory organ called a labyrinth, so they don’t need to breathe air. This means an aquarium designed for a betta does not need to have an air pump.
Likewise, a filter is not necessary for a small tank like this because, as the host mentions, he changes the water regularly. Some would suggest adding more plants to the tank in order to better filter the water and keep the fish healthy.