We save Bonne Maman jam jars, because they're great and have a wide enough mouth for our jam funnel. Generally, she makes enough to fill two or three jars at a time.
Partner can make stovetop curd, which has a longer shelf life, but these days she just makes curd in the microwave, because it's easy and she eats it fast enough that the shorter shelf life window doesn't matter.
I have made marmalade in the past, but jams and marmalades are a lot more faff, and much more molten sugar. There's more attention required and more peril of burning (me or it).
I think juicing citrus with skin on is bound to make it bitter, especially limes, which to me are more bitter - you have to be more careful zesting them not to get too much white.
We have a Tahitian lime, a Meyer lemon, three mandarin varieties, and a makrut lime. We used to have a blood orange and a fourth mandarin tree, but they died. We also have a self seeded peach and nectarine which never properly fruit, a fig which does but the birds and bats always feast before we get the chance, and Cavendish bananas. We have self seeded mulberries, too. We also have a mango tree, which was my late stepfather's third or fourth try at growing one. This one survived, and fruited the year after he died. It was one tiny fruit that first year, and each year since, there have been more. This year, I think there were over a dozen. You'd be forgiven for thinking we're on some kind of acreage. Nope. Suburban, 1/8acre block with a four bedroom home taking up most of the room. We are That House on the street where the home is somewhere behind all the garden. We have vegetable beds out back, too.