Many thanks, Espolon, Altos and Cazadores are all 30ish - Casamigos is more than double that.
As to Ranch Water, will
4oz Tequila
2oz Lime juice
6oz Club Soda
work?
Certainly. It's very much as you like it. That actually sounds pretty good to me, as I tend to like my cocktails very spirit forward (although I might split that in half so that I don't wind up with too much ice melting). That actually sounds a bit heavy on the lime, but that's totally a matter of personal taste.
If I were to order it at a bar, I would expect less tequila (probably more like a jigger, give or take), but you're more than entitled to pour a double-double at home!