Can I use the GSE and the ACV in the same water I give my girls?

These are my first chickens and I have one that is making sneezing noises. I'm not sure if it is serious or just a change in diet and location. I have 8 that are just now laying and 5 that should start in a month or so. Thought I'd try the GSE but I'm already using the ACV in the water, can I use both in the same water source? Any ideas?