Hey guys, I have been doing an experiment for my Biology class lately.
It consists of drinking ONLY one kind of beverage for 3 days & Measure body status (Temp, Pulse, Heartbeat, Etc) and also test performance in certain excersises. (Running speed, Memory, Endurance, Etc)
The experiment goes as follows: 
Measure stuff & Test performance in different things BEFORE drinking 
waterMeasure stuff & Test performance in different things AFTER drinking 
water (For 3 days)
3 Days drinking normallyMeasure stuff & Test performance in different things BEFORE drinking 
spriteMeasure stuff & Test performance in different things AFTER drinking 
sprite (For 3 days)
3 Days drinking normallyMeasure stuff & Test performance in different things BEFORE drinking 
coffeeMeasure stuff & Test performance in different things AFTER drinking 
coffee (For 3 days)
3 Days drinking normallyMeasure stuff & Test performance in different things BEFORE drinking 
milkMeasure stuff & Test performance in different things AFTER drinking 
milk (For 3 days)
3 Days drinking normallyMeasure stuff & Test performance in different things BEFORE drinking 
juiceMeasure stuff & Test performance in different things AFTER drinking 
juice (For 3 days)
Make essay(Hypothesis, Conclusion of what drink does what, What I measured, What I used to measure those things, What I tested, What I used to test those things, Diagrams showing the results, Comparition of the results)
Im going to compare all the drinks to water & Also compare all the BEFORE-AFTER results. But I ran into some trouble: I need a hypothesis.
I tried googling what the effects are of each drink but I couldent find any studies/experiments were I can find this information.
I found 2 things that are kinda close: 
Effects of coffee & 
Effects of soft drinksAnybody knows where to find the rest (& better versions of the ones I found)? I would really appreciate it if you could find any. Ive bee searching for hours now but nothing :SSS