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I don't have water (or it would harm me)

Your Situation

You need to purify yourself for prayer, but water is genuinely unavailable, or using it would cause you harm (illness, extreme cold, injury).

What to know

Allah has built a specific alternative into the religion for exactly this situation, called tayammum (dry ablution) — it isn't a lesser or informal option, it's a valid, complete substitute for wudu when water genuinely can't be used.

What you can do

Worth knowing: Tayammum is specifically for when water is absent, hard to reach, or would harm you — not simply for convenience when water is available but inconvenient to get to. If you find water before praying, tayammum is no longer valid and you should use water instead. Some scholars differ on whether one strike suffices for both face and arms, or whether two separate strikes are preferred — the method above (one strike) is well-attested and widely followed.
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DeenGuide gives general, sourced guidance — it isn't a fatwa. For your specific personal situation, consult a qualified local scholar.

Yunus Khan
Written by Yunus Khan
Founder of SabrTime — Building free Islamic digital tools that help Muslims strengthen their worship through technology.