Is the h2o ligand inducing a strong or weak field?

The answer is weak field

Water is relatively weak field.

Explanation:

Here's a good example ...:

[Mn (H2O) 6]2+:

Total electron count = - 7 (Mn) - 12 (water ligands) + 2 (charge) = - 17, 17 e-

Oxidation state, + 2 = Mn + (0), Mn = + 2, Mn (II)

d electrons, + 2 (oxidation state) - 7 (valence electrons) = - 5, d5

Because Mn is a first row transition metal, relatively low oxidation state, with a weak field ligand, the complex will be high spin with 5 unpaired electrons.

So if you have a weak ligand, the complex is high spin.