As the game moves the address for health to different places, a search can be done for a specific string which indicates the health value. Set the beginning address to 3000000 and the ending adress to 4000000. Search for 000000240000000000000003 if the prince has 3 full bottles of elixir. The hex 24 in the string can be set to a maximum of hex 76, which gives the prince 10 full bottles of elixir. This 76 should now be frozen by Magic Trainer Creator so that the next time it is played, it will be known what string to search for, e.g.

000000760000000000000003

However, for some reason, this doesn't always work.