The Melon Patch

I brought out a watermelon I purchased at the store to inspire my melon to grow big, just like it. Think it will work? I actually have some nice sized muskmelons in there! In the past, I have only been able to get one to about the size of a softball.
It has been so dry here, that I have been having to water the garden. I must have stepped on the hose walking out and it squirt some water on the ground. These white butterflies were all gathered trying to get what moisture they could out of it.