Hi! Trying to say this as gently as possible, because I know it will be disappointing. We are huge water parks fans too and going in July, so I totally can related to the disappointment that it has been posted in the Hub (the intranet for Disney CMs) that they water parks will NOT be open.
Also, based on the information posted in the Disney website and what has been enforced at Disney Springs, if your child will not wear a mask you will be asked by the "Distancing Squad" to go to the areas where you can take a "break" from your mask. These are designated areas away from the rest of the action, that are not in the rides, restaurants, etc., where you can sit down and take your masks and be distanced. You will need to have everyone 2 years and up wear your mask in the parks, walkways, rides, lines, etc. I remember when my kids were younger and this would have been super hard, so I completely understand. But, what we are hearing is that during the first few months, they will be completely enforcing their rules. They have reached agreements with the unions to protect the CMs and they have the directives from the lawyers and they will be completely enforcing mask usage. They originally had said 3+ for masks and they recently changed it to 2+ for masks, so they will be very strict about this. If they were remotely thinking about being flexible, they would have allowed kids/toddlers to have masks be optional.