Me and my wife take two bottles of .25 and we barely use half the 2nd. And I'd find a way to make the mesh mask comfortable. cutting/adding padding/bending the mask to fit your face goes a long way. Without it you will regret not wearing it.
Good boots if you do not have any and a pair of dry socks and change of footwear. Was very wet with large puddles on the main tracks when I played there. It was a full auto site, so having a second bottle of BBs cannot harm because it is better to take them and not use them rather than run running out.