Deep Magic Volume 2 (p.225)
Spoil Food and Water
3-level Conjuration
Casting Time: 1 action
Range/Area: 30ft.
Components: Verbal, Somatic
Duration: Instant
You spoil 45 pounds of food, grain, or seeds and 30 gallons of water, ale, or other potable drinks on the ground or in containers within range, normally enough to sustain up to fifteen humanoids or five steeds for 24 hours.
The food becomes moldy, rotten, vermin-infested, or liquified. The water is filthy and foul-smelling, and any creature consuming either the food or the beverage is ill for the next 24 hours, moving at half speed and with disadvantage on all ability checks and saving throws.
At higher levels: If cast at 4th level, you spoil up to 150 pounds of food and 100 gallons of beverage. If cast at 5th level, you spoil up to 500 pounds of food and 300 gallons of beverage.
Available for: Cleric, Druid