I could have written this!
I have a 20month age gap - DD1 is 23 months & DD2 is 3 months. I've been rather spoiled as my husband has been at home since DD2 was born but we're moving countries so it's all about to go tits up!
I'll be on my own for a month at home as he has to go ahead of us, and then will have a month in a small temporary apartment in a German city before we move into our new home.
I think I'll be ok for the month on my own as DD1 will be at nursery 5days a weeks. So although I've got the weekends to amuse them both, it is only 2 days and I can hopefully sleep while DD2 does.
But I'm bloody scared of the month in the city!! My plan is to try to have a bit of structure to our day (i.e. Like she's used to at nursery). So we'll get up and go out in the mornings - park, zoo, playgroup, museums etc, then come home for lunch and nap. Then an afternoon craft-type activity until Daddy comes home and I can have a rest!
I think play dough will be a lifesaver to be honest. I stick her in the highchair for it so she only makes a mess on the tray and stays in one place! It also means I can have DD2 on my lap and/or feed if I need to.
I also have a big plastic tablecloth that I put on the floor for messy activities so that I can just wipe it clean. And it sets a boundary for her that this is where we play.
I've also got a vibrating/bouncy chair to stick DD2 in so that she's occupied while I play with DD1.
But I can confidently predict there will still be a lot of CBeebies! Good luck!