Add comment to DEFINE_BOTTLES() in sketch.ino
pour_bottle(): Rename index variable from "bottle" to "i"
Calling String(Bottle) causes a compile error here. Fix by using Bottle.name directly.

Errors were:
src/sketch.ino:175:5: error: no matching function for call to 'HardwareSerial::print(Bottle&)'
Move pour_bottle into class Bottle