Playing on day 28, and still hungry and thirsty some days. Some thoughts on your predicament though:
1. Being hungry and thirsty is part of the challenge of surviving. It's a problem to figure out.
2. For the first week, I probably bought 10 waters from my local trader. I hated spending money on it, but it was either that or die of thirst. Want some quick spending money? If you can find a wrench, take apart vehicles with it. Most of the components fetch good prices at traders. I was lucky to find a wrench in the first few days, then I dissasembled probably a dozen cars, paid for my first water filter, then it was off to the races.
3. Dew collectors are a necessity now. Save up the money to buy the water filter. Build two of them if you can. I check my dew collectors at the end of day, right before dark, and in the morning. You'll get like 8 waters per day. You will only need half that to drink, so the rest you can use to make glue or food.
4. Check EVERY source you can for water. Toilets, drink machines, fridges, water dispensers, etc. Murky water is gold.
5. NEVER leave glue in loot. Every glue you take is one less water you need to use. For one quest I took 10 glue as a reward. Best day ever. 10 less water I needed to find. Since glue is a component of duct tape, you'll need a lot of it.
I actually think I've had more fun since they made food and water scarcer. The game has never been more survival minded than it is now. In old Alphas, I would be this late in game and not worried about food or water at all. I'd have tons of stockpiles, to the point where I stopped looking for it. I'm actually enjoying being concerned about it now.