So I found this Lindsay Press deal about how to make your own soda.
There are three options
1. Spend a lot of money and buy a commercial soda fountain or it's parts. Expect to pay at least $200 even on ebay for a carbonator unit (a pump and a chamber probably without regulators)
2. Ferment. Take sugar water, add yeast and wait. This is definitely the lowest cost solution, but I don't like to wait.
3. Follow the instructions that follow
4. OK There is a fourth option: Buy the premade stuff (but hey, this is "instructables" right? We like to Do it ourselves.
So Stuff you will need: CO2 canister - If you can't afford one (or don't drink enough beer to have a kegerator) then troll the streets. Restaurants often leave these out in back to be exchanged with new ones. Choose a large chain restaurant to steal from. No, don't steal. CO2 is useful for other projects. Buy a cylinder. They last a long time (essentially forever) You will need to buy a regulator. $40. buy a new one.
Step 1: Gather Materials
So gather your materials:
*Plastic 2-liter bottles - they must have that ring below the neck
- There are 2 neck sizes , and I have built this for the smaller, more common size.
- Metal plate - about one square foot should be plenty. Stainless steel is probably ideal. I used plain old mild steel, and aluminum could work if it's thick enough not to bend easily.
- Pipe Fittings - I'm using 1/4" pipe fittings
- short nipple (i used brass)
- valve (also brass)
- quick disconnect air fittings (2 male, 2 female) and some air hose
- teflon tape
- CO2 cylinder ( you can get a very small one which will last a good long time at a beer brewing supply store, or a welding supply store)
- CO2 regulators (also available at brewing supply store or welding supply store)
- wing nuts and carriage bolts (1/4" are good) about 2 inches long.
- some kind of gasket material. -- silicon aquarium sealant is probably best, but I have used bike innertube successfully