Nowadays, the most of PIC microcontroller was supported I2C communication interface. But, if your the microcontroller just has one I2C, and you want two or more I2C interface, I think the software I2C solution will the best selection. It's highly flexible. You can chose any pins of your the microcontroller to use for I2C.
This's my library software I2C, it's very simple to use and modified. I hope it will useful for you.
This's file software_i2c.h:
/**********************************************************
* Software I2C for PIC16F887 in master mode
*
* Complier: HT PIC
* Author: Truong Cong Tri
***********************************************************
* LIST FUNCTIONS
*
* soft_i2c_start() - issue start condition
* soft_i2c_stop() - issue stop condition
* soft_i2c_write() - send byte data
* soft_i2c_read(ack) - read byte data: ack=0 -> NACK, ack=1 -> ACK
*
*---------------------------------------------------------*/
#ifndef _SOFTWARE_I2C_H_
#define _SOFTWARE_I2C_H_
//define IO pin for i2c communicate
#define SCL_PIN RC0
#define SDA_PIN RC1
#define SCL_TRIS TRISC0
#define SDA_TRIS TRISC1
void soft_i2c_start();
void soft_i2c_stop();
unsigned char soft_i2c_read(unsigned char ack);
//ack = 1 -> send not ack signal (NACK)
//ack = 0 -> send ack signal (ACK)
void soft_i2c_write(unsigned char data_send);
#endif
