Chloe, Shedowser - I have found that the original bottles that I bought from one supplier, I had to squeeze the bottle to get the drops.
Then I got my next batch from a different supplier, all I had to do was to tip my plastic bottle on its end the drop came out. If I looked at them very closer, I believe they were the same size.
From what I understand, as long as you put 1 drop of 50 % activator to each drop of MMS - you will be fine. If you are really concerned, you can go to a pharmacy and buy one of their glass eye droppers and use that and all your drops would be the same.
If I remember correctly Keavys corner will also sell the glass eye droppers and if you buy the kit from him in glass bottles, he sends the glass droppers anyway.
Mine have always been yellow, no matter which supplier I bought them from.. I'm not positive, but I think I read somewhere on the forum that going to brown has to be how long, etc you activate.
The other guys will have to answer that.
Be blessed "Glenda"