Sand to Glass
Cheap, fast, and three other chains need the bottles.
Where to go
Sand — the beach on the far west coast, south of the Industrial center. Glassworks is in the Industrial center.
What to gather
Shovel required (Super Market). 6 sand pits.
Shovel 
Sand Bag How to process
Glassworks: 1 Sand Bag → 1 Empty Glass Bottle.
Empty Glass Bottle Where to sell
Bottles: Super Market, Glass bottle stall (Vineyard), El Cocodrilo. Also needed for Wine, Moonshine, Coca Paste and Heroin Bricks.
Empty Glass Bottle
TipA bottle is worth $5 and a sand bag $10 — make bottles for your own winery, not to sell.