Bacterial Meningitius can be contagious. Does the person who possibly drank the water before you have Bacterial Meningitius? The person is only usually contagious the first 2 days of symptoms.
You would DEF. know if you had it... you would have a VERY STIFF neck, headache, probably a fever... vomiting possibly...
The stiff neck is a dead give away. But DO NOT WORRY.
Don't let anxiety take over.
If you are that worried or concerned, make a little Dr.'s appt for a clean bill of health. I'm sure that's what you'll get. =)
If you had it you'd know it.