Some people just want to watch the whole world dehydrate, or how I learned to stop worrying and love Orisons.

From a conversation with a friend...
Lorgath: My cleric can solve that food problem just as easily. With his retarded produce 2 gallons of water 4+ times a day Orision.
Lorgath: or whatever you call it
Lorgath: Sorry, I meant the water problem
Lorgath: I do hate that sort of spell
Lorgath: it renders any culture in the desert meaningless.

Create Water has a long list of sheenanigans steming from the sudden creation of 16 pounds of fluid mass so it probably won't be missed. So for those who want their desert civilisations to resemble Arrakis, instead of Dubai...

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This spell are designed to be instead of Create Water.
Manna
School Transmutation

Level Cleric 0, Druid 0

Casting Time 1 standard action

Components V

Range Personal

Effect Self

Duration 24 hours

Saving Throw Will (harmless)

Spell Resistance Yes

As Share Manna below.

Share Manna

School Transmutation

Level Cleric 1, Druid 1, Paladin 1

Casting Time 1 standard action

Components V

Range Touch

Effect One creature touched

Duration 24 hours

Saving Throw Will (harmless)

Spell Resistance Yes

The affected creature  is sustained and nourished on magic alone. They do not require either food, or drink, for the duration of the spell but may voluntarily partake in them as normal. Extended periods of fasting will result in the character's appearance changing but magic prevents them from becoming fatigued or dying from starvation or dehydration.

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Edit: Increased level to 1st, created a personal-only version for 0th level.