Tayammum for the one who has water he needs, or who has water ahead of him

Question:
In the name of Allah, the Most Gracious, the Most Merciful. Praise be to Allah, Lord of the worlds. May Allah send prayers and blessings upon our Prophet Muhammad. Honorable Shaykh. Is tayammum prescribed for the one who…? Even if he is in the desert. And he has water. But he needs it. But Banu Rashid need it. Likewise, is it prescribed for the one who knows that there is water ahead of him, and ahead of him after the prayer?

Answer:
Yes, the one who has water but it is not sufficient for his need and his wudu' (ablution), he keeps it for his need. Even if he has medicine that requires this water, he prioritizes the need for the medicine over ritual purity, because ritual purity, praise be to Allah, has an alternative, which is tayammum (dry ablution), unlike the need for the medicine, which may cause him to die of thirst. So if he needs the water for himself, or needs it for his thirst, or needs it for his camel, he prioritizes the need and keeps the water for it, and performs tayammum for the prayer. Praise be to Allah. Yes. Yes. The second issue is in the hadith of Ibn 'Umar that it is said up to the elbows, and this is not established from the Prophet (peace and blessings be upon him); rather, it is the two hands as well.
Likewise, if the time for prayer arrives while he is on the road and he has no water with him—even if it is the most important prayer—and he reaches water, he has a choice. If he wishes, he may perform tayammum and pray at the beginning of the time; if he wishes, he may delay it until he reaches the water, as long as he reaches it before the time expires. They say that delaying it until he reaches the water is better, but if he performs tayammum and prays, his prayer is valid. Praise be to Allah. Yes. Yes. The second issue is in the hadith of Ibn 'Umar, where it is said "to the elbows," but this is not established from the Prophet (peace and blessings be upon him); rather, it is the two hands.