I think he also made a mention of hollow stump.
Sahih Muslim Book 36, Hadith 70
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I heard Ibn 'Umar say: Allah's Messenger (ﷺ) forbade (the preparation of Nabidh) in a pitcher besmeared with pitch, in gourd, in varnished jar. He said, I heard it from him more than once.
Sahih Muslim Book 36, Hadith 69 Next Hadith → I heard Ibn 'Umar saying: The Messenger of Allah (ﷺ) forbade (the preparation of Nabidh) in a green pitcher (besmeared with pitch), in varnished jar, and in gourd, and he said: Prepare Nabidh in small waterskins.
Sahih Muslim Book 36, Hadith 71
Sahih Muslim Book 36, Hadith 69 Next Hadith → I heard Ibn 'Umar saying: The Messenger of Allah (ﷺ) forbade (the preparation of Nabidh) in a green pitcher (besmeared with pitch), in varnished jar, and in gourd, and he said: Prepare Nabidh in small waterskins.
Sahih Muslim Book 36, Hadith 71