Well if I am going to use plastic I use the big 2 LTR bottles they cost $ 00.99 at City Markup, I drink the soda water and swill the Gin & Tonics. If im going to us plastic, might as well fill ur up. I get about 4 refills with the stock cap and bottle. Find a cool rib joint that serves up the 2 ltr bottles just like, um take out pizza-hut. Drink too much at your buddies place and the lost bottle is no big deal.