Whenever Allah's Messenger (ﷺ) went to answer the call of nature, I along with another boy used to carry a tumbler full of water (for cleaning the private parts) and a short spear (or stick).
Reference: Sahih al-Bukhari 152 In-book : Book 4, Hadith 18 USC-MSA web (English) : Vol. 1, Book 4, Hadith 154 (deprecated)
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