If the point was not established by other posters, well,
this
is the bottom line. You are asking for a safety ground.
Earthing does not provide a safety ground. A safety ground
must connect the appliance ground prong to circuit breaker box
safety ground - the neutral bus bar. Below are two solutions
and two taboos.

Worse than no wall receptacle safety ground is to connect
a safety ground to water pipes. All wire connections to
water pipes are to remove electricity. Removing electricity
from water pipes is why a bare copper wire connects city water
pipe to breaker box. When is a human at greatest risk to
electric shock? When wet. Wet human in a shower or bathtub
is why electricity in pipes can be so dangerous. Safer to not
safety ground the computer than to ground it to bathroom and
kitchen plumbing. Code also makes same demand. Common sense
says that plumbing is the last place to dump electricity.

Although no longer considered safe by code, one could run a
12 AWG green wire from wall receptacle to breaker box. That
being minimum grounding one can do for human safety.
Otherwise install a GFCI on that circuit (ie. in the first
wall receptacle on that branch circuit) and apply prerequisite
stickers that read "No Equipment Ground" to each wall
receptacle plate.

Again, this is grounding for human safety. Two possible
solutions are provided above - only one is approved by code.
Two solutions that are completely unacceptable as well as
outright code violations: grounding a wall receptacle to a
separate earth ground rod, or grounding to water pipes.

"Julie P." wrote:
It's not that I don't care about code, it's that this house
already violates so many times, that it would be pointless to
adhere to it anymore.