Looking for a sitz bath deep enough to soak vulva

Hello all I have recently started experimenting with Borax and baking soda sitz bath. I tried it yesterday for the first time here at my parents house because they have a bath tub and it seems to be helping. I am going back home tomorrow and I dont have a bath tub at my apartment. I had bought a round plastic sitz bath a few weeks ago but gave up using it because the water only reached my butt and didnt cover my upper labia which is where i need it the most. I saw on amazon a vagi sitz bath kit that is supposedly meant to cover the vulva area. Has anyone used this before? Or does anyone have any recommendations of other products? Also for anyone that has tried the borax and baking soda sitz bath, how long did you take baths before you actually stopped and didnt feel the need to take them anymore? Obviously I know my symptoms are not going to stop overnight, just wondering how long I might need to take them.