Water Level Gauge

Brand new user here - I don't know a thing about programming or coding. I only discovered Arduino a few days ago.

I want to make a water jug level gauge so I know when a “difficult-to-access” water jug is getting full. 

I found this level sensor that works with Arduino:

https://wiki.dfrobot.com/Non-contact_Liquid_Level_Sensor_XKC-Y25-T12V_SKU__SEN0204

and that is close to what I would like to make, assuming I can figure out how to make it illuminate a Red LED Warning Light when it detects water near the top of the jug.

However, I would prefer to have 3 lights:

GREEN    = less than half full

YELLOW = Jug is half full

RED         = Jug is nearly full, time to empty it!

I would use 3 of the non-contact Liquid Level sensors linked above, but my question is:

Could they all be connected to 1 Arduino, or would I need 3 separate Arduinos? 

Or is there an easier way to do this by using maybe a mini Traffic Light like this one on Adafruit:

https://www.adafruit.com/product/5435

Thanks in advance for any help!