I'd like to know the difference of three sentences.
1. I'll just have a sandwich for lunch.
2. I'll just get a sandwich for lunch.
3. I'll just grab a sandwich for lunch.
Thank you in advance.
#1. Stating meal preference.
#2. Stating meal preference and intention of (going out and) obtaining same.
#3. Same as #2 plus indicating hurried itinerary with only a short time allocated to the meal.