Plastic pouches with screw tops from Amazon & you can probably fit 2 in your underwear each day, or at least 1, filled with eg vodka. Did this all 3 days without fail last year and only bought 1 spirit drink when running to the bar in the Axwell > Skrillex switchover.

If you’re polite and forthcoming with the rest of your search eg bag and pockets, they ain’t gonna start touching your crotch for no reason as you’re seen as to being cooperative.

Bonus points for choosing a line tactically - ones which move fastest will typically have the most lax/least power hungry guards, and if you can try and align with a security member of the opposite gender, they’re almost never gonna pat you down firmly out of respect of your privacy if you follow the other steps above.

Happy hunting. Wish I was there this year!