Salam alaikum.

Al-Hilli reported in his “Kashf al-yaqin” (p 58, manuscript):

أَنَسِ بْنِ مَالِكٍ قَالَ: قَالَ رَسولُ اللهِ صَلَّى اللهُ عَلَيْهِ وَآلِهِ لأَبِي بَكْرٍ وَعُمَرَ: إمْضِيَا إلَى عَلِيٍّ حَتَّى يُحَدِّثَكُمَا بِمَا كَانَ مِنْهُ فِي لَيْلَتِهِ وَأَنَا عَلَى أَثَرِكُمَا. قَالَ أَنَسُ: فَمَضَيَا وَمَضَيْتُ مَعَهُمَا فَاسْتَأْذَنَ أَبُو بَكْرٍ وَعُمَرُ عَلَى عَلِيٍّ عَلَيْهِ السَّلامُ، فَخَرَجَ إلَيْهِمَا. فَقالَ: يَا أَبَا بَكْرٍ، حَدَثَ شَيْءٌ؟ قَالَ: لاَ، وَمَا حَدَثَ إلاَّ خَيْرٌ. قَالَ قَالَ لِي رَسُولُ اللهِ صَلَّى اللهُ عَلَيْهِ وَآلِهِ وَلِعُمَرَ إمْضِيَا إلَى عَلِيٍّ حَتَّى يُحَدِّثَكُمَا بِمَا كَانَ مِنْهُ فِي لَيْلَتِهِ. وَجَاءَ النَّبِيُّ صَلَّى اللهُ عَلَيْهِ وَآلِهِ فَقالَ: يَا عَلِيُّ حَدِّثْهُمَا مَا كَانَ مِنْكَ فِي لَيْلَتِكَ. فَقالَ: أَسْتَحْيِي يَا رَسولَ اللهِ. فَقالَ: حَدِّثْهُمَا فَإنَّ اللهَ لاَ يَسْتَحْيِي مِنَ الْحَقِّ. فَقالَ عَلِيٌّ: أَرَدْتُ الْمَاءَ لِلطَّهَارَةِ وَأَصْبَحْتُ وَخِفْتُ أنْ تَفُوتَنِي الصَّلاَةُ، فَوَجَّهْتُ الْحَسَنَ فِي طَرِيقٍ وَالْحُسَيْنَ فِي طَرِيقٍ فِي طَلَبِ الْمَاءِ فَأَبْطَآ عَلَيَّ، فَأَحْزَنَنِي ذَلِكَ. فَرَأَيْتُ السَّقْفَ قَدِ انْشَقَّ وَنَزَلَ عَلَيَّ مِنْهُ سَطْلٌ مُغَطّى بِمِنْدِيلٍ، فَلَمَّا صَارَ فِي الأَرْضِ نَحَّيْتُ الْمِنْدِيلَ عَنْهُ وَإذَا فِيهِ مَاءٌ، فَتَطَهَّرْتُ لِلصَّلاَةِ وَاغْتَسَلْتُ وَصَلَّيْتُ. ثُمَّ ارْتَفَعَ السَّطْلُ وَالْمِنْدِيلُ وَالْتَأَمَ السَّقْفُ. فَقالَ النَّبِيُّ صَلَّى اللهُ عَلَيْهِ وَآلِهِ لِعَلِيٍّ عَلَيْهِ السَّلامُ: أَمَّا السَّطْلُ فَمِنَ الْجَنَّةِ وَأَمَّا الْمَاءُ فَمِنْ نَهْرِ الْكَوْثَرِ وَأَمَّا الْمِنْدِيلُ فَمِنْ إسْتَبْرَقِ الْجَنَّةِ. مَنْ مِثْلُكَ يَا عَلِيُّ فِي لَيْلَتِكَ وَجِبْرِيلُ يَخْدِمُكَ. :

Anas ibn Malik has reported that the Messenger of Allah said to Abu-Bakr and `Umar: Go to `Ali and ask him about the last night event. I will follow you too. Anas further reports: Abu-Bakr, `Umar and I headed for `Ali’s house. Reaching there, we asked Abu-Bakr Has anything happened? Abu-Bakr said: If anything has happened, it is fair. Then, he said: The Messenger of Allah said to `Umar and me: Go to `Ali to inform you of the event which happened to you last night. At this time, the Messenger of Allah arrived and asked `Ali to tell us about the event of the last night. `Ali said: O Messenger of Allah! I am ashamed of telling the story. The Holy Prophet (s.a) said: Tell us the event, for God is not ashamed of telling the truth. `Ali said: O Messenger of Allah! Last night I was in need of water for purification but I could not find any. I was afraid my morning prayer be defaulted.Hence, I hastily sent Hasan and Husayn to two different directions to search for water but they were late and there was no sign of water. A kind of sorrow overwhelmed me for not having access to water. All of a sudden, I realized that the ceiling of the room cleft and a pail covered with a piece of cloth came down. When I uncovered the pail, I saw that it was full of water. Having purified myself with that water and having performed my prayer, I saw the pail of water going up to heaven and the cleft ceiling turned back to its former position! The Holy Prophet rejoicingly said: The pail was from heaven, the water was from Kawthar, and the cover was heavenly silk. Then, the Holy Prophet added: O `Ali, who could be like you last night when Gabriel was serving you?

Questions:

If time of pray is ending, and you afraid that you would miss it, because there is no water for purification. What would you do?

a) You would miss prayer.

b) You would wait for a miracle.

c) You would make tayamum.

I remember shias mocked amiralmuminin Umar ibn al-Khattab, that he said to man who had no purification, to miss prayer. We like Muslims know that each companion was fallible. And Umar could simply forget. What happen with Ali?
Why to not make tayamum?