Sanctify Water

 
Prerequisite(s): Cha 13+, ability to channel positive energy.
 
Benefit: By expending a daily turn undead attempt, you can infuse the water around you with positive energy, which has the same effect as holy water. All creatures in a 20-foot radius around you immediately take damage as though they'd been struck directly by a flask of holy water. The water retains positive energy for a number of rounds equal to 1 + your Charisma modifier, and deals damage each round. Creatures unaffected by holy water are similarly unaffected by this ability.
 
Source: Stormwrack