When you're 13 and you've all bunked off school and chucked in your lunch money to get an eighth of soap that bongmix method is the way to go
Tbh I would still use the same method for smoking a lot of the cheap slate that's around these days that seems to have replaced soap bar, there's a lot of shit about just in a slightly more presentable form.
Like I said though, definitely don't be trying to smoke good hash like that. Considered hotknifes? It's a fucking difficult skill to get right but if you can nail it then you don't need anything more than can be found in your average house.
When I was a teenager we used to nick those extendable metal car aerials, melt that through the side of a coke bottle, elastic band to hold it in place and half fill the bottle with water. Yes, I was a little bastard as a 15 year old and I'm not proud of it