If you don't have an actual plan to reach that goal, the goal is totally meaningless. You're a little bit spinning when you should be approaching this whole thing rationally and systematically, and with the means and resources that you actually have insead of what you dream of having (and nobody can tell you how to earn $62k in 3 months or they'd be doing it themselves). And now you want to sell your vehicle and replace it with something for $2000 - I'm just not sure how much benefit that is unless you know what you're going to be doing. It's all very erratic.
Firstly you need to manage your budget because it's out of control, and secondly you need to find ways to increase your income - but bear in mind that the two things are actually the same - saved money = earned money.
Grocery budgeting is a remarkably easy thing to master if you just use the principle that from now on, you make your food from scratch. You can actually eat far better quality food if you cook yourself anyway, so it's an all-round win except in the area of convenience.
A single meal for our family of 5 doesn't cost us more than about $5, so you can average that out - if breakfast for the family is $2 (usually oats or some other pap), lunch is either leftovers or something small cooked like tuna pasta bake for say $3, and dinner is $5 - which can be almost anything - you're sitting around $300, then you can add say $100-200 for miscellaneous food like nuts, fruit, ice cream, whatever - we spent $9 on a Lindt chocolate special today that will last us throughout May for instance. Okay I'm giving South African prices here and not sure how it compares but I think the prices can't be THAT much higher in the US and we eat really well. I could easily cut that down if I had to but I think we've found a comfortable budget zone with food and we don't feel pinched.