A report from Abu Hanifa does not make asking another person for his property categorically obligatory, noting the burden of requesting another's possession. Abu Yusuf and Muhammad distinguish cases based on whether the companion is likely to provide water.
The disagreement is about access to another person's property and the expected outcome of asking, not whether water can purify.
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Tayammum Materials, Intention, Nullifiers, and Searching for Water
A report from Abu Hanifa does not make asking another person for his property categorically obligatory, noting the burden of requesting another's possession. Abu Yusuf and Muhammad distinguish cases based on whether the companion is likely to provide water.
The disagreement is about access to another person's property and the expected outcome of asking, not whether water can purify.