Peace be upon you and the mercy of Allah and His blessings. According to Grand Ayatollah Sayyid Sistani (may Allah protect him), washing the urinary exit with water is necessary for purification, and one wash is sufficient in all cases (whether with little or a lot of water). However, it is recommended to wash twice with little water, and three times is better. According to Grand Ayatollah Sayyid Khamenei (may Allah protect him), it is obligatory to wash the urinary exit with little water twice after urination, but if using a lot of water, one wash is sufficient. May you be successful in all good deeds.