water.xml

<ForceField>
 <AtomTypes>
  <Type name="OW" class="OW" element="O" mass="15.99943"/>
  <Type name="HW" class="HW" element="H" mass="1.007947"/>
 </AtomTypes>
 <Residues>
  <Residue name="HOH">
   <Atom name="O" type="OW"/>
   <Atom name="H1" type="HW"/>
   <Atom name="H2" type="HW"/>
   <Bond from="0" to="1"/>
   <Bond from="0" to="2"/>
  </Residue>
 </Residues>
 <HarmonicBondForce>
  <Bond class1="OW" class2="HW" length="0.101181082494" k="462750.4"/>
 </HarmonicBondForce>
 <HarmonicAngleForce>
  <Angle class1="HW" class2="OW" class3="HW" angle="1.88754640288" k="836.8"/>
 </HarmonicAngleForce>
 <NonbondedForce coulomb14scale="0.833333" lj14scale="0.5" method="buckingham">
  <Atom
    type="OW"
    charge="-8.531254509373e-01"
    sigma="0.317796456355"
    epsilon="0.652143528104"
    c6="0.0026399910"
    c8="0.0001937841"
    c10="0.0"
    c12="4.696188795608e-06"
    parameterize="c12"
  />
  <Atom
    type="HW"
    charge="4.265627254686e-01"
    sigma="1"
    epsilon="0"
    c6="0"
    c8="0"
    c10="0"
    c12="0"
  />
 </NonbondedForce>
</ForceField>