Possibly *[Sahara][1]* (1995) with Jim Belushi which was a remake of the 1943 movie of the same name which starred Humphrey Bogart.

>An American tank commander in Libya who, along with a handful of Allied soldiers, tries to defend an isolated well with a **limited supply of water** from a Libyan Afrika Korps battalion during the Western Desert Campaign of World War II.

Although the French soldier is not hallucinating, he does pantomime eating cheese.

The whole movie is available on [YouTube][2] in some regions with the scene at c.52:45


  [1]: https://www.imdb.com/title/tt0114324
  [2]: https://youtu.be/m8TU2_fR8TM