Definitely the major met factors are rainfall for deciding the water availability in surface and ground waters as well quality aspects. If the drought occurs, acquifer recharge is not there and the water table goes down, as well the surface water availability for consumption purpose also goes down.
The quality of rain water, in terms of pollutants and unwanted material, gets affected.
If the rainfall is less, in general also the pollutant concentration with the water also increases.
Meteorological factors which affects the water loss, is basically driven by solar radiation which is effected by temperatures, wind speed, relative humidity in deciding the water loss in terms of evaporation and transpiration, which also affects the water availability for consumption purpose.
there is an interesting paper about the water shortage of 2014/2015 in Southeast Brazil, where the authors discuss increasing population and water consumption.