Additional pic

Tomato

Totally looks like bacterial wilt.

One vine dying, the ones next to it healthy.

Is there anything we can do?

If it is bacterial wilt from the cucumber beetle there isn't much you can do. Pull the plant and dispose in the garbage can away from your garden and/or compost.

Go to the link below and search other possibilities.

Your other plants look wonderful - mine are full of Angular Leaf Spot due to the constant heavy rains.

Your tomato looks like it might have Early Blight. Remove the leaves and spray with a fungicide is the recommended action.

Here is a link that might be useful: Cucurbit Problem Solver