AC leaking water into front passenger floor.. on 2001 Nissan Altima

Can I fix this myself? AC works fine but all the condensed water now leaks into the car! And, any idea of the cost if done at a repair shop?
Thanks so much!

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1 answer 1 comment
The heater box is on the passenger side of the dash. Open the passenger door, kneeling in the passenger door opening look with a flash light at the bottom of the heater box there is usually a little black rubber hose that allows water caused by condensation on the evaporator to drain out into the engine compartment at the firewall. I suspect a passenger has inadvertently knocked of the hose from its attachment at the fire wall or heater box.
thank you sounds easy is there any where i can view a picture of thi hose i cant seem to locate it on my 96 altima