Like the title says, drinking melon juice returns 2 empty bottles, which you can exploit to get infinite bottles.

Also, this may be intended, but I can drink the juice even when full to continue filling my saturation level, all the way up to max saturation.

I have tested this, but drinking melon juice does not return 2 empty bottles. If this issue still persists for you, you can join the discord server and send us a clip of this issue. Thanks!