Gin and Juice first time

Me and my friends are bringing some Gin and Juice to split for our friends party.

We have never had Gin and Juice before, and the Tanq we bought is 47.5%

We are moderate drinkers, probably around 20 drinks a week.

How much of the Gin and Juice would we be able to drink without being a danger to the people around us?

Is 2 cups too much, or can we push like 4?

Thanks for the help.

Also what ratio of Gin to Juice in a standard solo cup?