First of all, you can't do this if you're afraid of blood :)
I also don't recommend using washable pads if you're you have water scarcity problem in your area.
But if you interested, I can give you some tips based on my opinion:
Wear sanitary-panty (a panty with plastic lining, it won't leak on normal condition).
Always bring another clean cloth pads.
If you still not confident enough, always bring your favorite (disposable) pads.
The pads achive its maximum absorbency after 10 washes, so you need to wash it often before you wear it.
You need to spend more time..and water to wash it. Cloth panty liner is easy to clean, but bloody pad needs more effort.
Use less detergent. Cloth pad absorb detergent and using too much of it would lead to more water...and time to rinse.