Watering by hand is a necessity for many gardeners when an extensive drip irrigation system is not available. Even if a drip irrigation system is in place for part of the garden, inevitably there will be far-flung plants and container plants that are not on the drip system. You can water with a hose, a watering can or with buckets.
Water plants in planters when the top of the soil feels dry to the touch. Apply water with a hose or watering can until the soil is evenly damp all the way through the pot and water starts to seep out of the drainage holes in the bottom.