I marinade the chicken with salt, pepper, garlic, lemon, parsley, bbq sauce, etc, so I just take each piece (or couple of pieces) and wrap it up in plastic. I'll make up 5 or 6 packs and put them all into one large freezer bag (so they'll avoid freezer burn for a while). Like this, there's no marinade to to take the chicken 'out of' as the marinade is just what's coating the chicken (if there's a bit extra marinade, I'll just put a spoon or two of it on the chicken before wrapping it). (Same thing for the steak. I've even done it a couple of times with salmon, although he doesn't like it as much...
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But, I have packaged cooked chicken with gravy - I put everything in a ziploc bag and freeze it. I've told him not to microwave in the baggie but, once frozen, he can just cut the plastic bag and take out the frozen chicken/gravy in one piece. Or, I've told him to run it under hot water and then slide the chicken/gravy out into a pan.
Hope this makes sense.
(Actually, the plastic wrap/baggie is so that I can ensure he doesn't microwave in plastic containers! LOL If I send the glass 'tupperware', I end up losing quite a few! If I send it in the cheaper plastic containers, I worry he'll be rushing and will just microwave it in that container... Putting it in the plastic wrap/baggies forces him to put it in a pan.
And saves me money! :lol
I also always send S lots of individual instant rice packs. I always forget the brand name but it's a common rice brand. It's really convenient, takes only a minute in the microwave and he quickly has a side dish. The brand I buy has plain rice (basmati, jasmine or brown rice) or they have a number of flavoured rices (these I haven't tried).