I wish you the best, but personally I don't think it's the best way. Can you swim? If you can, SI can jump in and ruin your plans. Even if you drunk. And even if you don't know how to swim, it's still vary painful way to go. I don't think it's very realistic, but you do you. I just want you to be as comfortable as you can be.
I can't imagine myself drowning, but again it's only me.
I wish you the best. I hope you will find peace. And if you want to talk, I am open to it. Good luck.