Worried after new package install

I’ve had my bees one week and have been feeding them with a freezer bag, and worried about the same thing. (So I know how you feel!) I’m going to switch to a double jar top feeder as soon as I can. Sambees has a good post about his feeding setup. My bees are building comb and buzzing about, but when it’s overcast, they stay in the hive until it warms up.