I have cod and every recipe that I can find says to use lemon juice, but I personally hate lemons. What can I cook the cod with, other than lemons? I don't want it to be dry and I want to bake the cod.
Lemon is used as a flavoring, not as a cooking liquid, it's not going to keep the fish moist. The secret of having moist fish is the same as having moist beef, chicken or any meat or poultry: don't overcook it. Cooking releases moisture from the flesh, so cooking it well is all about timing - getting it cooked enough to have the internal temperature and consistency you want and no more as every extra second means more moisture lost. Fish is especially sensitive to timing, but with a bit of practice anyone can cook fish well.
Fish, meat or poultry will have a juicy mouth feel when there is enough moisture stored in the flesh after cooking. Overcooked fish in a pool of sauce will still have a dry mouth feel, whereas perfectly cooked fish with no sauce at all will have a moist mouth feel.
As for what to cook cod with as a replacement for lemon the answer is nothing. Fish has enough moisture to begin with, and when baking you don't need to assist heat transfer. Lemon is simply a flavoring, so replace it with flavoring you like. This could be browned butter (or just a bit of butter) if you want richness, or herbs if you like, or you could just season it with salt and pepper.
If you want to get more fancy you could seal it up in parchment paper or foil (oil the foil so it doesn't stick) with a tiny bit of water or butter and some herbs and bake it that way, it seals in the moisture and creates a sauce - delicious!
There's certainly no requirement to use lemons if you don't care for them or simply don't have any. Here's a batch of cod that I just baked tonight:
Placed on a baking sheet lined with parchment paper, drizzled with some olive oil and seasoned with salt, pepper, garlic powder and Old Bay seasoning — but use what ever appeals to you.
Bake in a moderate oven (385F) for about ten minutes, until the thickest part of the fish flakes apart easily like you can see in the picture. Don't overcook the cod and it won't get dried out.
Baking on parchment paper also makes cleanup very easy!