Yeah, you should be good. You can get money and experience easily by pounding Happy Happy cultists. Just make sure whatever money you have on hand is deposited in the bank. Like Dragon Quest, if you die, you lose half your money, and all of your Psi Points are drained, necessitating a stay at a hotel. Happy Happy Village's hotel costs $50.
Another swank thing you can do is abuse the food stand. You can buy bananas and fresh eggs from the food stand just south of the drug store, and you only have to pay what you think you should pay.
Load up on fresh eggs, and continue as normal. Eventually, those eggs will hatch in to Chicks, and then will eventually grow in to Chickens, which you can sell for 100% profit. Just make sure you don't talk to the guy in green who's standing near the stand, he'll fight you.
I think you're pretty limited as far as healing items go at that part. Aside from the eggs and bananas, if you got the phone number for Mach Pizza, I guess you could call them and order a small pizza. The rub of that is that it takes a while for it to be delivered, and I don't know if the deliveryman can get out to Happy Happy Village.