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!

Asked by for the 2001 Nissan Altima
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
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