Language is fun.
English: I am thirsty
Fr/Sp: I have thirst
Gaelic (h/t @kiki_d): Thirst is on me
Hindi: To me, thirst is coming
@SallyStrange German is also 'I have thirst'.
As mentioned by Cedara, "durstig" is not a verb but an adjective.
In the context mentioned by Rhi, however, "thirst" implies a noun. 🤓
So in this case "Ich habe Durst" would be the only correct translation in my opinion.
»Life is too short to learn German.« – some 18th-century guy once remarked.
Don't tell anyone but I'm a native speaker, as well. 😁
One of the first Mastodon instances, there is no specific topic we're into, just enjoy your time!