Babycook water levels

One thing that intimadated me right away was the water levels. 1...2...3...what happens if you get it wrong?

I took some of the mystery out of it by using my measuring cup and measuring the levels.
1 = 2.5oz
2 = 4oz
3 = 6oz

Generally...
Rice and Pasta use level 3
Veggies use level 3
Fruits use level 2
Haven't found a use for level 1. If anyone knows...please share.