It is meant to be restrictive - so you don’t run any risk of cc with gluten. That really is the fundamental basis. It isn’t meant to be fun or interesting. It is meant for people who are very sick and the normal gluten-free diet isnt working. It is a last step before medications. It is not a lifestyle or a life long diet. So, for those who really need it for its original intent- they are going to follow it to the letter with a doctor , who is versed in Celiac.
Lots of people try parts of it on their own as a way to sort of “shore up” their gluten free diet. So, interpret it how you think it will help you best. I see many people use it as a starting point when they are new and need time for some healing and time to figure the whole gluten-free food life. Some go back to it when they have had some gluten and need to rest their gut.
For drinks - maybe iced tea or water with a squeeze of fresh lemon, lime or orange? Maybe those water infuser things that you add fresh mint or fruit to your water? Simple and easy to digest.
Just saw that you are doing it for DH control. I think I saw that it is not likely to help out of control DH. But it is certainly worth a try before taking medications.
I have ataxia and for me it is a feeling like walking on a ship that is in a high sea. I had ataxia since childhood and needed canes by the time I was diagnosed. Over 40 years later... Ataxia has pretty much resoved but I did need to get physical therapy to walk normally. I don't however feel dizzy thankfully. If the dizzy feeling sticks around after your other gluten symptoms resolve it might be a good idea to see an ear doctor just to be on the safe side. Sometimes our body gets so busy fighting the antibody reaction that other virus can sneak in.
Corn would not make DH flare unless it was either CC'd in processing or was contaminated through your prep and cooking process. For example grilling the corn on a grill that had gluten prepared on it previously or washing it in a colander that had pasta drained previously. IMHO Squirmy is spot on. Give yourself some time to heal on the gluten free diet and avoid HIGH iodine sources like iodized salt, seaweed and seafood. The bit of natural iodine in veggies and fruits shouldn't be an issue. If your other celiac issues like D or C etc have resolved then you are healing. DH is a bear for many and you may flare for a while but there will be a lessening in time. Hang in there it will get better.