Yes, Vivo Y95 does have the dual camera set-up at the rear side. It has a 13MP primary rear camera and 2MP secondary rear camera.
No. Vivo Y95 is not a waterproof mobile phone.
No. Vivo Y95 does have a dual sim card slot and a dedicated memory card slot. You can use 2 4G sim cards and a MicroSD card at the same time.
Vivo Y95 comes with 10W / 5A output charger.