To fill a small humidifier, follow these steps:First, ensure that your small humidifier is unplugged and turned off.Locate the water tank on the humidifier. Remove the tank from the base by gently lifting it or twisting it counterclockwise, depending on the model.Take the water tank to a sink or faucet for filling. Check if your humidifier requires distilled or filtered water, as some models may be sensitive to mineral deposits. If so, use the appropriate type of water.