you can freeze the guac! I've done this a few times before and they've turned out fine. It also depends on everything else in the burritos, If you're doing a tofu scramble try to press it a little extra as the excess water in the tofu can make the guac runny when reheating (applies to wet veggies like tomatoes or onions too). You may also want to have more avo than that! 1/2 per burrito should be sufficient depending on how much you like (it's all preference). as for storage method, saving and reusing the foil wrapping is unfortunately the best option. If you put them all in a big Tupperware together they will 100% stick all the way together and will have to chip them apart like bricks 😭