I think (I am just guessing really) that three liters would not hold enough moisture for a good sized plant.
You might end up watering it three times a day.
It might also not allow enough root to grow and stunt the plants, as most plants seem to grow almost as much root as they do greens.

Again it is just a guess and your idea might work fine.
The only thing we ever planted in baskets was fuchsia for the humming birds so they would buzz around the house.