The ice cube tray really does work best, that way you can fit more of a variety in the freezer and give more variety at each meal. Plus, mine would eat more sometimes and less sometimes, there was less waste with the cubes. I found the 1 oz to be too small, I just got regular ice cube trays and used those (2 oz) and then switched to a freezer ziplock when they were done. (yours doesn't eat abnormally large portions, that sounds about right.) I got several small glass pyrex bowls (4 oz size with lids) and would thaw everything in those. Pull a cube out, thaw it covered in the bowl in the fridge, or thaw it in the microwave and then feed it to baby. I try to never use plastic in the microwave.
One thing to remember is that baby is still getting most of it's nutrition from formula/breastmilk at this age. So if you give applesauce 3 days in a row, it isn't such a big deal. After a year, you will want to have a bigger variety. But at that point they look at a child's nutrition for a whole week, not each day. One day can be nothing but chicken, with fruits and veggies and variety the rest of the week, and that is just fine.
Food is good for about 6 mos on average, just FYI.
I would just make a small variety of things to start if you are limited on space. One yellow/orange veggie, one fruit, on green veggie. If you make some babyfood once or twice a week and use up what you make before you do more, you should be good. Soon he will be eating everything you are and you wont have to worry about making and freezing everything. I did still use cubes until about 19-20 mos with mine, they are just so easy. But I started introducing table food at about 10 mos and at about a year he was eating mostly the same as us, just softer, smaller versions.
I agree about storebought applesauce. Way easier and cheaper. You can even get organic for what it costs to make it yourself. I started with small portion cups and he would take about 2 days to eat one, then moved on to the jar and never have a problem using it.
One thing i found that worked great was freezing little cubes of fresh apples. If just peel them, cut them up, freeze and then thaw them in the fridge, they are a perfect consistency for baby that can gum but needs to learn to chew. (tried it with pears too, but mine were way to mushy.) I use a lot of frozen fruit that you buy at the store to give to my son. Lots of them are softer consistency. Just pull some of the bag and thaw in the fridge for a snack. If they are big chunks, cutting them smaller while still frozen works great. Anything that didn't seem soft enough after defrosting, I would microwave for a few seconds then cool it and give it to mine.
I also did this to give my son yogurt. I skipped the yobaby and other store-sweetened yogurts. They have a ton of sugar. Even the baby organic "healthy" kind. So I buy the big container of plain yogurt, pull some frozen fruit out every morning, microwave it for a few seconds, mash it (or cut it/chop it) and mix it with plain yogurt. I still do this for my 2 yr old breakfast most days. Its a lot cheaper to buy that big container. I started that at about 10 mos, and did it everyday to be able to use the container up before it went bad.
Baby sweet peas (frozen) will be good to introduce soon, after you have done a few things with texture. If you get the baby sweet ones and cook them til soft, he can just eat them like a finger food.
You can do whatever you like for him as far as combos. The websites I gave you last time have great combo ideas. Just look up the individual fruit or veggie in the search feature, and they will tell you how to prepare it and what it is yummy to mix it with. And you can definitely start mashing up what the rest of you are eating, as long as they are things you already introduced to him to check for allergy reactions. It took me until my son was 12 mos to get through all the fruits and veggies I could make myself. Gerber has a much more limited selection than if you make it yourself. But if we were having broccoli for dinner, I just made some softer for him and mashed it up.
You don't HAVE to let things cool in the fridge before putting in the freezer but you should. If you put a large container of hot food in the freezer it can start to defrost things and that is not good. But an ice cube tray shouldn't do that. BUT, if you cool it first, it is less likely to get freezer burn from "sweating" and it will stay tastier. If something goes inthe freezer hot, it will sweat moisture while it is cooling, and then that moisture will freeze on it.
Sorry so long, but there is a lot of info about making your own! Everyone has recipes and tricks. And making your own will make it so much easier to feed your toddler well. I have found that it is much easier to know what to feed mine now, because I just make the same stuff but don't puree it. Hope all that helps!