So I just became a LV14 Druid and I just got the ability to change my form with alter self and was curious If I could use this while in Wild Shape. Like, if I turn into a Fire Elemental could I then use Alter Self to look like my regular self? I know its says that you have a to "cast" it, but its also says "at will". I take that as I don't have to do any kind of V,S or M. I just think it and I change to that. Just trying to get a clearer picture of the limitations of Alter Self.
When it says "at will", it means that you do not consume spell slots. You still must provide spell components (V, S and M). You can use alter self in wildshape when you take beast spell. IN that case yes, you can change the appearance of your current form.
Alter self is a concentration spell, so what if you cast it before assuming a beast shape. You retain the concentration of your spells when you assume beast shape, so would you still be able to use your alter self while in your beast shape?
According to the wording of Alter Self you can use an action to end one effect of the spell and switch to another one. So I'd say that a druid could cast Alter Self, Wild Shape, and then use Alter Self to give the Wild Shape beast form extra abilities.