Hey Kim,
I was in a similar position you are. I am single and got Tayda when she was 2 and then a year later I added Lenny as a 14 week old puppy. It was hard at first, since I work 40 minutes away from home, but I made it work. Took really long lunches to come home and check on them and thankfully Lenny caught on pretty quick to the potty training thing.
I really don't find 2 much more work than 1. But, Tayda is REALLY low key and never got into anything. Lenny is more of a handful, but I actually find it fun. Walking them together is o.k, definitely takes some quick twisting/turning motions when the leashes get caught and they decide to run in different directions. And then picking up after them can get tricky when they are both orbiting in different directions and I'm holding both leashes in one hand and a poop bag in the other. But if you have a yard they can play in, this probably wouldn't apply.
The other area that I find more complicated, is when I had just Tayda, I'd bring her to my friends houses with me. Tayda would just sit in my lap mostly. Now with Lenny, I just can't cart around 2 dogs to someone elses house and be sure that one of them won't get away and pee on the floor or something. So now I mostly leave them home together.
As for food and vet… its just more money.. not necessarily more work. Tayda and Lenny eat just fine next to each other and are not food agressive toward each other at all. So I'm lucky there.
Overall I really like having 2 vs. just 1. They keep each other company, lay all over each other, and chase each other around. sometimes they get on each others nerves, and then there is a smackdown (usually tayda puts lenny in his place) but even that is fun to watch.