It is impossible to say what and how much "is enough" without more detailed information. But in general, if you are exercising at an intensity where you are sweating, then failure to replenish will definitely impact your performance.
Coconut water is well studied and one of the most natural hydration substances available. I just wanted to mention it because no one else has so far. From the most scientific studies I could find:
[Coconut water] was significantly sweeter, caused less nausea, fullness and no stomach upset and was also easier to consume in a larger amount compared with [a carbohydrate-electrolyte beverage] and [plain water] ingestion. In conclusion, ingestion of fresh young coconut water, a natural refreshing beverage, could be used for whole body rehydration after exercise.
[sodium-enriched fresh young coconut water] was similar in sweetness to [coconut water] and [sports drink] but caused less nausea and stomach upset compared to [sports drink] and [plain water]. In conclusion, ingesting [sodium-enriched fresh young coconut water] was as good as ingesting a commercial sports drink for whole body rehydration after exercise-induced dehydration but with better fluid tolerance.
Unfortunately I have not found it to be cheap, and it tastes funny.
Milk may also hydrate better than trendy sports drinks or water. This surprised me a lot at first when I read it so I just wanted to mention it so people could begin to research it for themselves too.
Milk better than water to rehydrate kids, study finds.
Which does make sense since it is created to keep young animals healthy without anything else.
I love Pacific Health Accelerade. It is a sports drink so I understand it isn't what you are asking for. I am just suggesting it so you can consider and research the benefits of a ratio of fast digesting protein combined with the hydration of your choice if you continue to strive for longer or more intense runs. To answer your question directly, you could make something similar but more natural yourself with some maltodextrin for carbs, mix in some BCAA's for protein, and a banana or coconut water for the potassium (electrolytes).
Now that you have something to drink...
Start fully hydrated before the exercise by drinking plenty of liquid hours earlier and regularly. Your urine should flow clear before you start (vitamin supplements can make this step hard to tell because you can be hydrated but excreting very yellow unused B). You can't cram hydration. Then when you exercise, drink an amount as close as you can estimate to replace your lost bodyweight as you lose it. Drink before you feel thirsty..don't drink enough to feel sloshy.
How to carry...
If you need to carry liquid with you, consider a hands free container like a lightly loaded CamelBak. That should allow you to sip without anything holding you back.