Water and Electric are included in most rent prices (if not its a max of 30KD/month for both).
Gas is not a thing here. Unless you mean propane for the stove (1kd per propane tank, cheap AF)
Internet depends on where you live. But for the most part you will probably go with unlimited 4G LTE wireless internet for about KD10-15 per month.
PS> If you are considering coming to live in kuwait check this: