Water has distinct absorption bands in the infrared region, specifically around 3400 cm^-1 (stretching vibration) and 1600 cm^-1 (bending vibration). These absorption bands can be used to identify the presence of water in a sample when performing FTIR analysis.

yes peak around 3300 cm-1 represents -OH bond

The exact bands and spectrum of water can be found in the literature. You can find water absorption bands, for example, in the following publications (bound and free water bands) [1-4].

As for molecular water, rocks are opaque in the bending vibration region. So the overtone (1700+3500 = 5200) is an indicator of molecular water.