Prerequisites
An Arduino UNO R3 board (http://store.arduino.cc/product/A000066)
Arduino Ethernet Shield R3 (https://www.adafruit.com/products/201)
A liquid flow sensor (http://www.futurlec.com/FLOW25L0.shtml)
A Hitachi HD44780 DRIVER compatible LCD Screen (16 x 2) (https://www.sparkfun.com/products/709)
A 10K ohm resistor
A 10K ohm potentiometer (https://www.sparkfun.com/products/9806)
Few Jumper wires with male and female headers (https://www.sparkfun.com/products/9140)
A breadboard (https://www.sparkfun.com/products/12002)