In another narration, 'He was told that people are finding it difficult to fast (during the journey) and they are waiting to see what the Prophet (ﷺ) will do. So he called for a cup of water after the Asr (afternoon) prayer and drank it.' Related by Muslim. (IT)
English reference (IT): Book 5, Hadith 694 (IT)
Arabic reference (IT): Book 5, Hadith 672 (IT)