The spell Armor of Agathys says:
Components: V, S, M (a cup of water)
Does the cup of water get used up in the casting of the spell?
I have a player casting this over and over and I'm wondering if he has enough water.
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From Spellcasting, on material components:
Casting some spells requires particular objects, specified in parentheses in the component entry. A character can use a component pouch or a spellcasting focus (found in “Equipment”) in place of the components specified for a spell. But if a cost is indicated for a component, a character must have that specific component before he or she can cast the spell.
If a spell states that a material component is consumed by the spell, the caster must provide this component for each casting of the spell.
A spellcaster must have a hand free to access a spell’s material components—or to hold a spellcasting focus—but it can be the same hand that he or she uses to perform somatic components.
Armor of Agathys does not say it consumes the water, so it does not.