What I typically do is have an inserter(s) which moves items from the belt to a chest, then another inserter(s) which moves items back from the chest to the belt.
You will need to wrap the belt around the chest, or use multiple chests, in order to get this to work.
It works much better if you have a mod that adds bigger (in area) chests. Warehouses are 6x6. It's also trivial with diagonal inserters.
Keep in mind you don't want to do this for every production line. Creating too many of an item that won't be a bottleneck is just a waste of resources.
Um... that answer doesn't exactly apply to this specific question? :)
The Offshore Pump produces... 60 units of water per second." Source: Offshore Pump
As we know, pipes can handle up to 150 units of water per second. Therefore it will take more than just 1 pump to achieve full capacity.
150/60 = 2.5, or 3 minimum pumps to achieve 150 "pressure".
In fact using the "pumping stations" from the other answer literally won't even work if your input isn't as high as your desired output. If you're putting in a single pipe from a single pump into any of those stations, the maximum output will still be 60. Those stations can't "increase" more water than they get in the first place through the single input pipe.
That being said, because the first 30 "pressure" drops off so quickly, it's probably best to just stick to 120 pressure. This will start you off with only 2 offshore pumps and pumping stations far less, if you're needing to transport water so far.
If power is your concern, consider the following:
My reasoning is based off this Wiki page that states that one pump can fuel 10 Steam engines and 14 boilers
1 pump on 1 pipe handles 10 engines, because it pumps 60 units per minute, and the engines consume 6 units a minute. 10 engines consume... 60 units per minute.
You can also use 2 pumps, 28 boilers, and 20 engines, etc. Basically if input/output = 1 then you're good.
(1 pump * 60 pressure = 60) / (10 engines * 6 consumption = 60) = 1
(2 pumps * 60 pressure = 120) / (20 engines * 6 consumption = 120) = 1
If you're going for the 150 it gets a little wonky and not a perfect 1, but oh well.
If you're pumping other liquids you'll likely need storage tanks as your output (since you can't "offshore pump" those liquids), as these "single" sources can actually have up to 3 small pumps draining them, and since smalls only add or "push" 30 "pressure" you'll need 5 in a small distance to achieve 150 pressure, or just 4 if you're fine with the 120 pressure.
Oh, and as a final note to the small pumps, be warned, they have a maximum pumping capacity of 30 pressure. MAX. That means if you put just a single pump anywhere in the length of your pipe you have created a maximum throughput of 30 for the entire length of pipe after that single pump. If you feed that pump 150 pressure it still only puts out 30 pressure. (As depicted in the first "pumping station" in the other answer's image.)
Best Answer
You can use the copy and paste feature. First, make an extra unused belt somewhere else. Place red/green wire on it and configure it as you wish.
After that, press Shift and Right click the belt. All settings were copied.
You can now Shift+Left click any belt and the settings will be pasted on it - even if it doesn't have any wires attached. Once you attach red/green wire, the pasted settings will take effect immediately.
The only downside is that it's impossible to see what the settings are (and whether you pasted them successfully) before attaching the belt.