I suggest thorough research on the subject and detailed planning of your route including surprises and redundancies.
If you don't speak the languages, you will need a guide and translator/fixer. If you do speak the languages, you will still benefit from one. You will need a satellite phone. Clothes and equipment for the rain-forest ware down fast. I would take snake proof boots and trousers or some gaiters - this will help with leaches also. You will need to fix your vehicle/s so basic skills for that are required either from you or some one in your group. You will need food and water, water filters, power supplies, knives, cooking supplies, mosquito repellent (i suggest the least poisonous ones and add to that mosquito proof clothing), mosquito nets, hats, sunglasses and safety glasses (for under the canopy), a hammock would probably be useful as well as mule tape and other cordage and redundancies for all of that.
You may also benefit from watching this video:
https://www.youtube.com/watch?v=EgGsW7DR34cWhen you have pondered all of this you might clearer about your budget needs. Afterwards, it would not be unwise to double it.