Don't just use sterile water or saline for reconstituting—those might be good for 28 days on their own but not when you're using them for multiple draws. BAC water has the alcohol to keep bacteria and fungi out. There's a reason it's there, please stay safe.
Watch the pH with cagri - that's the real thing to dial in. Use proper BAC water, not just regular saline, and aim for pH around 4 to keep it safe from bacteria growth.