Have you considered getting a crock pot with a sous vide option? Getting one of those and a vacuum sealer for sous vide would allow you to expand your variety by a lot. I use a rice cooker to make rice and add diced broccoli to it. Then I use an air fryer to make sweet potatoes and dice that up. Mix it all together for rice bowls.

Consider getting these containers. They're amazing and water tight despite a bunch of use. They used to have an option for half 16oz and half 32oz but it's not there anymore. I recommend getting both a 16oz and a 32oz pack and leaving most at home. Keep the lid off if you're freezing liquids in them because they're so water tight that they expand on the bottom and don't sit flat on the bottom. That's how air tight they are.

I go to the asian market and get beef bones and chicken feet to make bone broth. I also use bones from rotisserie chickens I buy. I also get some veggies. Total cost is about 20 bucks for ~6 gallons of bone broth, because I do a second batch with the same bones. You could do this when you're home and use it on the road. I use the 32oz containers to store the broth in my chest freezer. If you got a larger freezer you could take them on the road and this would increase the quality of your meals considerably. Use the broth instead of water. The broth can also be microwaved to drink it straight. It's pretty good.