I have heard that in the winter it is often more important to provide water for birds than food. Living in California, we normally don't have to worry about that.
Indeed..I missed being at home during the big ice storm...I admit I fretted over leaving the birds so long..but I know there are other bird feeders and water suppliers in my neighborhood.Here during the summer water is needed,too..at least it is what lured them back first in June when I had been gone frome home so long.
They give me so much joy that I do feel "responsible"!