What types of tile require a wet tile saw?
For cutting porcelain or ceramic tile, standard practice is to use:


A wet saw with a diamond blade
A manual tile cutter (a carbide wheel slides along a rail to score the tile, then you snap on the line.
Tile nippers for complex shapes


You can use a diamond blade with a hacksaw to cut holes, but it won't be very efficient.

If you have mostly straight lines, you can get away with a decent manual cutter and perhaps a pair of nippers. A wet saw makes the job go faster, but is not necessary.