The only bottle I have found is on the second mission, (the same one that was in the demo). After laying both explosives head to the designated position and climb onto the wardrobe. Before you go to the area where the cut scene starts look to the rooftops opposite and left of your position. There'll be a sniper on the roof and a bottle close to him.
As for the gold bars, they're everywhere. On the same mission as above there's oneat the end of the long road you start at, (below and a little to the left of the sniper), another at the end of the alleyway behind the house you snipe the level's target from. On the next mission there's one in the toilet bowl of the building on the right and another on a desk in the same building. There's another on a desk in the other building. I can't remember where I've found others but I've missed loads too.