There are a number of reasons any plant will wilt , not just insect pests or disease. Too much soil moisture can cause that as well as too little. The picture does not show what you think it does.

there is a gourd forum... especially in regard to a name ... [i have also seen gourd discussion on the cornucopia forum ]

your pic shows no sign of wilt ... so were can we go with such???

i have had gourds cover 10 square feet... your pot sounds tiny ...

in august.. these things can grow so fast... that they cant support themselves... and for a day or two.. it can simply LOOK like wilt ... but again.. the pic????

ken

shawski, "It seems to kind of bounce back at night - but seems to be bouncing back less and less."
That observation suggests "temporary wilt" transitioning into "permanent wilt" which indicates a drying out condition in the soil. You can try making a nail hole in the bottom of an empty one-gallon water jug. Fill the jug with water and place it at the root of the vine to provide 'drip irrigation'. Adjust the drip rate by loosening / tightening the cap of the jug. If the vine holds up all day, water might be the limiting factor.
My grand mother would observe the kitchen garden for the same symptoms and she would decide when to water. The grandchildren would have the onerous task of fetching the water.
She would water the kitchen garden in the afternoon when required; but the flower garden was watered in the morning.

I can't help with the wilt, but the squash looks like it could be a Buttercup. They're usually a little more flattened than this, but not always.

Too much soil moisture.
Too little soil moisture.
The plant is pot bound and the roots cannot uptake needed moisture.
Too much sun that causes a plant to loose moisture faster then that moisture can be replaced.
Too much fertilizer.
Too little fertilizer.
A lot of reasons why any plant might wilt.

Here is a link that might be useful: 7 reasons plants wilt

Fire ants! This seems to work for me. I had several beds of them in my raised little garden where I grow a few pepper plants tomatoes etc. I didn't want to use any poison, so I've read the pros & cons of using instant grits. So, like the chicken soup, may not help but won't hurt. I put about 1/4 cup on each bed. After a few days I decided it didn't work. Then in about a week, to my amazement they were gone! Have used it on another couple of beds in the yard, worked on them also. Ureaka!