SODA SYSTEMS!!
Here are some of the various soda systems that we can install or repair, just a few examples
   

A Small, countertop unit with a cold bath to chill the sodas. You'll need a separate Ice Supply for this one.  These come anywhere from 4 valves to 6.

Better quality than a Bar Gun, not as good as a full size Soda Fountain.

Here's an example of an 8 Valve Lancer with Ice Bin.  It has an Ice Chute in the middle and produces an excellent quality end product.  These come in configurations from 6 up to 12 valves.
Here's a "Drop In" Dispenser.  There is a bin of Ice in front of the valves.  Typically this is in the back of the house (kitchen area) where customers do not see.  These are high-quality, high volume machines. They make quite a bit of condensation, especially down here in Houston, TX!   You can get these from 6 to 10 valves.
This is similar to one above, but this is the Cornelius Brand.  It has a built in Ice Bin and Ice chute for customer's cups.  This Enduro 200 can hold 200 lbs of Ice.  The Enduro comes in 6 to 14 valves and the Enduro 150 holds 150 lbs of ice, whereas the Enduro 300 holds, you guessed it.. 300 lbs of ice.
16 Brands in a 30" footprint!  Internal Cold Carbonation. A very high quality end product. 
This "Mustang" tower is basically a disguised bar gun mounted inside this cover.  It has a cool digital menu on the front but the quality is only as good as a bar gun.
There's nothing better to top off cocktails with a splash of soda, coke, diet, tonic, or sweet n sour.   It's not the best option for serving a full drink if someone just orders a coke.  But you can do it and many places do.