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Grapes prefer a rich soil with lots of nutrients. Normally, you would plant them in the ground in your garden, so you don't need to get soil from somewhere but you may need to amend you soil to grow good grapes. You can grow grape in containers as well and Miracle Gro soil is great for growing them in a container. You will need to provide them with enough water, since they cannot grow deep roots to find water, but as long as you can provide the water, they will be fine. Typically, in a container, they will need water every day during the summer and need some protection from the cold in the winter. I would recommend using a slow release fertilizer, like Osmocote, on it during the summer to make sure it gets enough nutrients.

They don't need acidifiers, but for both plants, fertilizing once a year will help them grow better. Any plant that flowers or fruits benefits from the addition of phosphorus. Just be careful for any plant, including the tomatoes, that you do not add too much.

The grapevine should be fine. In fact, it too can benefit from an occasional pruning. Here is an article that you may find helpful: https://www.gardeningknowhow.com/edible/fruits/grapes/prune-grape-vine.htm

You can. You may affect the fruiting of the plant, but the plant itself will be fine.

These articles will help: https://www.gardeningknowhow.com/edible/fruits/grapes/prune-grape-vine.htm
https://www.gardeningknowhow.com/edible/fruits/grapes/growing-grapevines.htm

This could be a number of things--too little or too much water, over fertilizing, leaf scorch, etc. I would recommend using a slow release fertilizer, like Osmocote, on it during the summer to make sure it gets enough nutrients. This article has more information: https://www.gardeningknowhow.com/plant-problems/environmental/what-causes-brown-edges-on-leaves-of-plant.htm