It is narrated from Ibn Shihab that Sayyida Aisha (may Allah be pleased with her) and Sayyiduna Sa’d bin Abi Waqqas (may Allah be pleased with him) did not see any objection in drinking water while standing.
Hadith Referenceموطا امام مالك رواية يحييٰ / كتاب الجامع / 1678