Hydroxyzine, alcohol, maybe air duster for good measure, to make drowning easier?

[VileMagnolia]

If I were to try drowning in a body of water, would downing a bunch of Hydroxyzine with strong alcohol, letting it kick in, then getting in the water make it easier to counteract SI and perhaps make it at least marginally less agonizing? Additionally, I'm considering air duster to inhale when I stand in the water (if I actually went through with this). I could just jump from the nearby bridge which was my original plan, but I feel that would be quite scary and I'd likely be seen by passing cars and possibly rescued, so I'd rather walk into the water with assistance from substances.