Visual Distribution of Free Capacity

I’ve long wanted an online interface where I could choose, for various activities in my immediate future (the next week), how much time I want to devote to a specific activity, and have 5 containers into which I could pour portions of time for each activity. By activities I mostly mean a specific project. But it could also be exercise or studying, etc. When I pour it into the individual containers, I’d see how much remains undivided for each activity — how many more containers it would fill. That’s a rough outline; what mattered to me more was the visualization, so a person can get an idea of it. When you try something like this in a calendar or project app, it’s usually quite chaotic and even depressing.