What fungicide are you using? Hopefully daconil or mancozeb? Forget the baking soda - unless you have powdery mildew, it's pointless and may interfere with the fungicide. There's just no way to know if your plants will recover or not, but people usually underestimate their plants. Stay diligent with the fungicide, follow the instructions. With daconil or mancozeb, remember that you only need to get the tops of the leaves, and to reapply after substantial rain. Mulch heavily.

I have had that same problem for years.I used to water frequently. the farmer i bought my seedlings said not to water the tomatoes? this year i only waterd one time for four hours with the hose laying on the ground. so far i have not experienced any of the wilting that i used to get near the end of july. i am no means any expert at all. when i read this forum it seems there are many opinions on how and when to water the plants. it is kinda confusing on the watering issue. good luck

Close-ups are helpful but even better is if we also see an entire plant. Please post picture of an entire affected plant. From your picture and description could be as simple as nitrogen shortage.

I have been growing in containers for many years indoors and in greenhouses, but not outdoors where they are exposed to the elements. I have grown with chemical and organic fertilizers in containers so i'm familiar with both. I haven't grown tomatoes in about 15 years and the last time I did, they were put in the ground. This is the first time, i'm growing them in containers and its outside. After reading your comments, im guessing that because I received an excess amount of rain for many days, that my soil ended up flushing out a good portion of the nutrients from containers. Then immediately after it was really hot and many time humid. I live in NC in zone 7b. With the excessive rain and then heat my soil may have also experience ph swings possibly locking out nutrients (this is just speculation) My soil in the containers is as follows: Daddy Pete's Organic Lawn and Garden Soil (contains manure), Bagged Oranic Humus and Manure, Mixed Large Amounts of Dirt from the ground with it. A lot of my ground soil contains a lot of clay and sand. Mixed all that together then added the following Amendments: Bone Meal, Blood Meal, Natures Blend Organic Fertilizer (Made by Miracle gro, its a green bag and its OMRI listed) Azomite Rock Dust for trace minerals Organic Lime Hollands Giants Mycorrhizae I added a decent amount of each I didn't add a whole lot because the plants were small so I didn't want to burn them and the bagged soil already had manure in it. I Mixed all that into the huge pile of dirt and then proceeded to fill the bags with the small plants. They were fine at first then when I got hit will all the excessive rain and then hot and humid weather (84-91 Degree F) their health rapidly declined. I was trying to stay organic like I said, hopefully that can workout. I appreciate everyone's help Im also going to add more soil to the bags and or transplant them into bigger bags if the plants bounce back. I just didn't want to do it because of their health and especially since I thought it was a pathogen or fungi. I didn't want to waste all the money on dirt if I had to toss all that soil out.